If you’ve ever sat through an SEO pitch and nodded along while secretly Googling half the terms being thrown at you, this SEO glossary of terms is for you. I’ve compiled 185 definitions here, but I haven’t just copy-pasted textbook entries. Each term includes context on why it matters and, where relevant, how it plays out in the Singapore market specifically.
I’ve organised everything alphabetically so you can bookmark this page and come back to it whenever you need a quick reference. Let’s get into it.
Numbers and Status Codes
Before we hit the alphabet, let’s cover the numerical terms you’ll encounter constantly in SEO audits and technical reports.
10x Content
Content that is at least ten times more valuable than whatever currently ranks number one for your target keyword. This isn’t about word count. It’s about depth, originality, and usefulness. If the top result for “best CRM for SMEs in Singapore” is a generic listicle, your 10x version might include hands-on comparisons, pricing in SGD, integration details with local payment gateways like PayNow, and real screenshots.
301 Redirect
A permanent redirect that tells search engines and browsers: “This page has moved permanently. Go here instead.” The critical part is that a 301 passes roughly 90-99% of the original page’s link equity to the new URL. Use this when you’re migrating domains, restructuring your site, or consolidating pages. If you’re moving from an old .com.sg to a new .sg domain, 301 redirects are non-negotiable.
302 Redirect
A temporary redirect. This tells search engines the move isn’t permanent, so they should keep the original URL indexed. Use this for A/B testing or temporary promotions. A common mistake I see with Singapore e-commerce sites: using 302s during site migrations when they should be using 301s, which means the old URLs keep their index status and the new ones never gain traction.
304 Not Modified
A server response telling the browser that the page hasn’t changed since the last visit, so it can load the cached version. This speeds up repeat visits and reduces server load. You’ll see these in your server logs, and they’re a good sign. They mean your caching is working.
404 Error
The page doesn’t exist. Every site has some 404s, and that’s normal. The problem starts when you have hundreds of them, especially if other sites are linking to those dead pages. You’re leaking link equity. Run a crawl with Screaming Frog monthly and redirect or fix any 404s that have inbound links.
410 Gone
Similar to a 404, but more definitive. A 410 tells search engines: “This page is gone and it’s not coming back.” Use this for content you’ve deliberately removed and don’t plan to replace. Google will de-index 410 pages faster than 404 pages.
A
A/B Testing
Running two versions of a page simultaneously to see which performs better. In SEO, this might mean testing two different title tags to see which gets a higher click-through rate. Tools like Google Optimize (now sunset, but alternatives like VWO and Optimizely exist) let you split traffic between variants. One caution: make sure your A/B test setup doesn’t create duplicate content issues. Use canonical tags properly.
Algorithm
The set of rules and calculations search engines use to decide which pages rank where. Google’s algorithm considers over 200 ranking factors. The algorithm updates constantly, with major named updates (like the Helpful Content Update or Core Updates) happening several times a year. When your rankings suddenly shift, an algorithm update is often the reason.
Alt Text
Descriptive text assigned to an image in your HTML. It serves two purposes: accessibility for visually impaired users, and helping search engines understand what the image shows. Write alt text that describes the image naturally. “Hawker centre in Chinatown Singapore serving laksa” is good. “Best laksa Singapore cheap food hawker SEO” is keyword stuffing.
AMP (Accelerated Mobile Pages)
A Google-backed framework for creating stripped-down, fast-loading mobile pages. AMP was once heavily promoted, but Google has since removed AMP as a requirement for appearing in Top Stories. Most Singapore businesses don’t need AMP anymore. Focus on Core Web Vitals instead.
Anchor Links
Links that jump to a specific section within the same page. The table of contents at the top of this glossary uses anchor links. They improve user experience and can generate sitelinks in search results, giving your listing more real estate on the SERP.
Anchor Text
The clickable text in a hyperlink. Anchor text signals to Google what the linked page is about. If fifty sites link to your page with the anchor text “Singapore corporate tax guide,” Google understands that page is relevant for that topic. Diverse, natural anchor text profiles are healthy. Over-optimised anchor text (the same exact-match keyword repeatedly) looks manipulative.
Authority
A general measure of how credible and trustworthy a website is in the eyes of search engines. Authority is built through quality backlinks, consistent content publishing, and positive user signals. It’s not a single metric you can check, but tools like Ahrefs (Domain Rating) and Moz (Domain Authority) provide proxy scores.
Auto-Generated Content
Content produced by software without meaningful human input. Google’s Spam Policies specifically target auto-generated content that doesn’t add value. Note: AI-assisted content that’s been reviewed, edited, and enhanced by a human is treated differently from pure auto-generated spam. The key is whether the content is helpful to the reader.
B
B2B SEO
Search optimisation for businesses selling to other businesses. In Singapore’s B2B landscape, this often means targeting longer sales cycles, decision-maker keywords (“enterprise ERP solutions Singapore”), and creating thought leadership content. The search volumes are lower but the value per conversion is significantly higher.
B2C SEO
SEO for businesses selling directly to consumers. Think “best running shoes Singapore” or “affordable dental clinic Tampines.” B2C SEO typically involves higher search volumes, more competitive keywords, and a stronger emphasis on local SEO and reviews.
Backlinks
Links from other websites pointing to yours. Backlinks remain one of the top three ranking factors. Quality matters far more than quantity. One link from The Straits Times or a respected .edu.sg domain is worth more than a hundred links from random directories. Building backlinks ethically takes time, but it’s the foundation of off-page SEO.
Black Hat SEO
Tactics that violate search engine guidelines to manipulate rankings. Examples include cloaking, link schemes, hidden text, and doorway pages. These might produce short-term gains but almost always result in penalties. In Singapore’s relatively small market, a Google penalty can effectively kill your online visibility overnight.
Bounce Rate
The percentage of visitors who land on a page and leave without taking any further action. A high bounce rate isn’t always bad. If someone searches “GST rate Singapore,” lands on your page, gets the answer (9%), and leaves, that’s a satisfied user. Context matters. But for service pages or product pages, a high bounce rate usually signals a problem with content relevance or page experience.
Brand Authority
The trust and recognition your brand has earned within your industry. Google increasingly rewards brands that demonstrate real-world authority. Consistent mentions across news sites, industry publications, and social platforms all contribute. For Singapore businesses, being featured in local media like CNA, Business Times, or Vulcan Post builds brand authority signals.
Breadcrumbs
A navigational element showing the user’s path through your site hierarchy. Example: Home > Services > SEO Audit. Breadcrumbs help users orient themselves and give search engines additional context about your site structure.
Breadcrumb Schema
Structured data markup that tells Google how to display your breadcrumb navigation in search results. Implementing this is straightforward with JSON-LD and can make your search listing more informative and clickable.
Broken Links
Links that point to pages that no longer exist. They create dead ends for both users and search engine crawlers. Audit your site for broken links quarterly at minimum. Tools like Screaming Frog or Ahrefs’ Site Audit make this a five-minute job.
C
Canonical Tag
An HTML element (rel=”canonical”) that tells search engines which version of a page is the “master” copy. Essential when you have similar or duplicate content accessible via multiple URLs. For example, if your product page is reachable via both /products/widget and /category/widgets/widget, the canonical tag prevents Google from splitting ranking signals between them.
Click-Through Rate (CTR)
The percentage of people who see your listing in search results and actually click on it. Average CTR for position one on Google is around 27-31%. If your page ranks well but has a low CTR, your title tag and meta description likely need work. This is one of the quickest SEO wins available.
Cloaking
Showing different content to search engines than what users see. This is a serious violation of Google’s guidelines and will result in a manual penalty. Don’t do it. Not even “just a little bit.”
Content Gap Analysis
The process of identifying topics and keywords your competitors rank for that you don’t. In Ahrefs, you can run a Content Gap report comparing your domain against three competitors. The output is a list of keyword opportunities you’re missing. I run this analysis for every new client engagement.
Content Freshness
Google gives a ranking boost to recently published or updated content for certain queries, especially news-related or time-sensitive topics. For evergreen content, updating statistics, adding new sections, and refreshing the publish date can recapture freshness signals. We’ve seen pages jump 8-15 positions simply by updating outdated content with current data.
Content Marketing
Creating and distributing valuable content to attract and retain a defined audience. Content marketing and SEO are deeply intertwined. Your content strategy should be driven by keyword research and search intent, not just what you feel like writing about.
Core Web Vitals
Google’s three key metrics for measuring page experience: Largest Contentful Paint (loading speed), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability). These are confirmed ranking factors. Check yours in Google Search Console under the “Core Web Vitals” report. Most Singapore sites I audit fail on LCP due to unoptimised hero images and slow hosting.
Crawl Budget
The number of pages Googlebot will crawl on your site within a given timeframe. For small sites (under 10,000 pages), crawl budget is rarely an issue. For large e-commerce sites or news portals, managing crawl budget through robots.txt, internal linking, and sitemap optimisation becomes critical.
D
Data-Driven SEO
Making optimisation decisions based on actual data rather than assumptions. This means using Google Search Console data, analytics, rank tracking, and log file analysis to guide your strategy. If you’re not measuring it, you’re guessing.
Deep Links
Links that point to specific inner pages of your site rather than just the homepage. A healthy backlink profile has deep links to blog posts, service pages, and resource pages, not just your homepage.
Disavow Tool
A feature in Google Search Console that lets you tell Google to ignore specific backlinks. Use this only when you’ve been hit by a manual penalty for unnatural links, or when you’ve identified clearly spammy links you can’t get removed. Don’t disavow links just because they have low Domain Authority.
Domain Authority (DA)
A score developed by Moz (0-100) predicting how likely a domain is to rank. It’s not a Google metric. It’s a third-party estimate. Useful for comparing domains, but don’t obsess over it. I’ve seen DA 25 sites outrank DA 60 sites because their on-page SEO and content relevance were superior.
Duplicate Content
Identical or substantially similar content appearing on multiple URLs. This confuses search engines about which version to rank. Common causes include www vs non-www versions, HTTP vs HTTPS, and URL parameters. Fix with canonical tags, 301 redirects, or parameter handling in Search Console.
Duplicate Meta Descriptions
When multiple pages share the same meta description. Each page should have a unique meta description that accurately reflects its content. Google Search Console flags these in the HTML Improvements report.
Dwell Time
The amount of time a user spends on your page before returning to the search results. Longer dwell time generally signals that your content satisfied the searcher’s intent. Improve dwell time by making your content scannable, engaging, and genuinely useful.
E
E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness)
Google’s framework for evaluating content quality, especially for YMYL (Your Money or Your Life) topics. The first “E” for Experience was added in December 2022. For Singapore businesses in finance, healthcare, or legal sectors (where MAS and MOH regulations apply), demonstrating E-E-A-T through author credentials, citations, and transparent business information is particularly important.
E-commerce SEO
Optimisation strategies specific to online stores. This includes product page optimisation, category page structure, faceted navigation handling, schema markup for products (price, availability, reviews), and managing thin content across thousands of product pages. Singapore e-commerce sites also need to handle multi-currency and GST display considerations.
Editorial Links
Backlinks earned naturally because another website found your content valuable enough to reference. These are the gold standard of link building. You earn them by creating genuinely useful resources that people want to cite.
Entity-Based SEO
Optimising for entities (people, places, things, concepts) rather than just keywords. Google’s Knowledge Graph understands that “Apple” can mean a fruit or a tech company based on context. Structured data and consistent entity information across the web help Google understand what your brand is.
Evergreen Content
Content that remains relevant and valuable over time. This glossary is an example. Evergreen content consistently attracts organic traffic without needing constant updates. Pair it with periodic refreshes to maintain accuracy.
Exit Rate
The percentage of visitors who leave your site from a specific page, regardless of how many other pages they visited during their session. Different from bounce rate, which only counts single-page sessions.
External Links
Links on your site that point to other websites. Linking out to authoritative sources (government sites, research papers, reputable publications) can actually strengthen your content’s credibility. Don’t hoard link equity. Link out when it genuinely helps your reader.
F
Faceted Navigation
Filter systems on e-commerce sites that let users narrow results by attributes like size, colour, price, or brand. The SEO challenge is that each filter combination can create a unique URL, potentially generating thousands of thin, duplicate pages. Manage this with canonical tags, noindex directives, or robots.txt rules.
Featured Snippets
The highlighted answer box that appears above the regular organic results (position zero). To win featured snippets, structure your content with clear definitions, step-by-step lists, or comparison tables. We’ve found that pages already ranking in positions 1-5 are most likely to be pulled into featured snippets.
Featured Videos
Video content that Google surfaces directly in search results. YouTube videos are favoured, but properly marked-up video content on your own site can also appear. Use VideoObject schema markup.
Follow Links (Dofollow)
Standard hyperlinks that pass link equity to the destination page. Unless a link has a rel=”nofollow” attribute, it’s a follow link by default.
Footer Links
Links placed in the website footer. These appear on every page, so they carry site-wide weight. Keep footer links relevant and limited. A footer stuffed with keyword-rich links to every service page looks spammy to Google.
Freshness Algorithm
Google’s system for giving ranking preference to recently published or updated content, particularly for queries where freshness matters. Searching “Singapore budget 2026” triggers freshness signals. Searching “how to tie a tie” does not.
Fresh Content
Newly created or recently updated content. Publishing fresh content regularly signals to Google that your site is active and maintained. But fresh doesn’t mean rushed. A well-researched article published once a month beats daily thin posts every time.
G
Geo-Targeting
Optimising your content and site to target users in a specific location. For Singapore businesses, this means including location-specific terms naturally, setting up Google Business Profile correctly, and ensuring your site’s hreflang tags are properly configured if you serve multiple countries.
Google Alerts
A free monitoring tool that emails you when new content matching your specified keywords appears online. Useful for tracking brand mentions, competitor activity, and industry news.
Google Analytics
Google’s free web analytics platform (now GA4). It tracks user behaviour, traffic sources, conversions, and more. If you’re doing SEO without Google Analytics, you’re flying blind. Set up GA4 properly with event tracking, and connect it to Google Search Console for a complete picture.
Google Business Profile (GBP)
Your business listing on Google Maps and local search. For any Singapore business serving local customers, GBP is essential. Complete every field, add photos regularly, collect reviews, and post updates. GBP optimisation is the single most impactful thing you can do for local SEO.
Google Search Console (GSC)
A free tool that shows how Google sees your site. It reports on indexing issues, search performance (impressions, clicks, CTR, average position), Core Web Vitals, mobile usability, and manual actions. Check it weekly at minimum.
Google Trends
A tool showing the relative popularity of search queries over time. Useful for identifying seasonal trends, comparing keyword popularity, and spotting rising topics. In Singapore, Google Trends data can reveal local search patterns around events like National Day, GST voucher disbursement periods, or school holidays.
Guest Blogging
Writing articles for other websites in exchange for a backlink to your site. Still effective when done on relevant, quality sites. Avoid guest posting on sites that exist solely for link exchanges. Google can spot these networks.
H
Header Tags (H1-H6)
HTML tags that define content hierarchy. Your H1 is the page title (use only one per page). H2s are main sections. H3s are subsections within H2s. Proper header tag structure helps search engines understand your content’s organisation and can improve your chances of winning featured snippets.
Heatmap Analytics
Visual tools showing where users click, scroll, and hover on your pages. Tools like Hotjar and Microsoft Clarity reveal how real users interact with your content. Invaluable for identifying UX issues that hurt engagement and conversions.
Hidden Text
Text that’s invisible to users but readable by search engines (same colour as background, tiny font size, CSS hidden). This is a black hat technique and will trigger a manual penalty.
Hreflang Attribute
An HTML attribute that tells search engines which language and regional version of a page to show to users. Critical for Singapore businesses with separate sites for different markets (e.g., .sg for Singapore, .com.my for Malaysia). Incorrect hreflang implementation is one of the most common technical SEO errors I encounter.
HTML Sitemap
A page on your website listing all important pages in a structured format. Helps users navigate your site and gives search engines another way to discover your pages. Different from an XML sitemap, which is specifically for search engines.
HTTPS
The secure version of HTTP, encrypted via SSL/TLS certificates. HTTPS has been a confirmed Google ranking signal since 2014. There’s no reason not to use it. If your site is still on HTTP, you’re leaving rankings on the table and your browser is showing visitors a “Not Secure” warning.
I
Image Optimisation
Compressing images, using modern formats (WebP, AVIF), adding descriptive alt text, and specifying dimensions to prevent layout shift. Images are often the biggest contributor to slow page loads. Compressing images alone can improve your LCP score by 30-50%.
Inbound Marketing
Attracting customers through valuable content rather than interruptive advertising. SEO is a core pillar of inbound marketing. You create content that answers questions your potential customers are already searching for.
Index Bloat
When search engines index pages that shouldn’t be indexed, such as tag pages, filter pages, internal search results, or staging environments. This dilutes your crawl budget and can confuse Google about which pages matter. Audit your indexed pages by searching “site:yourdomain.com” and compare against your intended index.
Indexed Pages
Pages that Google has crawled and stored in its database. Only indexed pages can appear in search results. Check your index status in Google Search Console under the “Pages” report.
Internal Links
Links connecting pages within your own website. Internal linking is one of the most underused SEO tactics. It distributes link equity, establishes content hierarchy, and helps Google discover new pages. Every important page should be reachable within three clicks from the homepage.
Interactive Content
Content requiring user participation: calculators, quizzes, interactive maps, configurators. These tend to generate higher engagement metrics and more backlinks. A “Singapore property stamp duty calculator” is a good example of interactive content that serves search intent perfectly.
IP Address
The numerical label assigned to each device connected to a network. In SEO, IP addresses matter primarily in the context of hosting (shared vs dedicated IP), CDN configuration, and geo-targeting.
J
JavaScript Frameworks
Front-end frameworks like React, Angular, and Vue.js that can create SEO challenges because content is rendered client-side. If Googlebot can’t render your JavaScript, it can’t index your content. Server-side rendering (SSR) or pre-rendering is usually the solution.
JavaScript Lazy Loading
A technique that delays loading images and other elements until they’re about to enter the viewport. Improves initial page load speed. Use native lazy loading (loading=”lazy” attribute) for images below the fold, but never lazy-load your above-the-fold content or LCP element.
JavaScript SEO
The practice of ensuring JavaScript-heavy websites are fully crawlable and indexable. This involves server-side rendering, dynamic rendering, proper internal linking (not JavaScript-only navigation), and testing with Google’s URL Inspection tool to verify what Googlebot actually sees.
Jump Links
Another term for anchor links. They move users to a specific section of the same page. Commonly used in long-form content and FAQ pages.
JSON Feed
A data format for syndication, similar to RSS but using JSON instead of XML. Less common in SEO but relevant for content distribution and API integrations.
JSON-LD
The preferred format for implementing structured data on your website. JSON-LD (JavaScript Object Notation for Linked Data) is added to the page’s head section and doesn’t interfere with the visible content. Google recommends JSON-LD over Microdata or RDFa. Use it for Organisation, LocalBusiness, FAQ, Product, Article, and other schema types.
K
Keyword Cannibalisation
When multiple pages on your site compete for the same keyword, splitting ranking signals and confusing Google about which page to show. Diagnose this by searching “site:yourdomain.com [keyword]” and seeing if multiple pages appear. Fix it by consolidating content, differentiating page intent, or using canonical tags.
Keyword Density
The percentage of times a keyword appears relative to total word count. There’s no ideal keyword density. Write naturally. If your keyword appears 3-5 times in a 1,500-word article and it reads well, that’s fine. If you’re counting percentages, you’re overthinking it.
Keyword Mapping
Assigning specific primary and secondary keywords to individual pages across your site. This prevents cannibalisation and ensures every page has a clear purpose. I create keyword maps in spreadsheets: one row per page, columns for primary keyword, secondary keywords, search intent, and target URL.
Keyword Research
The foundation of any SEO strategy. Identifying what your target audience is searching for, how often, and with what intent. Tools include Ahrefs, SEMrush, Google Keyword Planner, and Google Search Console (for queries you already rank for). In Singapore, factor in Singlish variations and bilingual search behaviour.
Keyword Stuffing
Cramming keywords unnaturally into content, meta tags, or alt text. This was effective in 2005. In 2026, it triggers spam filters and makes your content unreadable. Write for humans first.
Knowledge Graph
Google’s database of entities and their relationships. It powers the information panels you see on the right side of search results. Getting your brand into the Knowledge Graph requires consistent entity information across authoritative sources, a Wikipedia page (if notable enough), and proper structured data.
KPI (Key Performance Indicator)
Measurable values that track the success of your SEO efforts. Common SEO KPIs include organic traffic, keyword rankings, organic conversions, click-through rate, and indexed pages. Define your KPIs before starting any SEO campaign, not after.
L
Landing Page
A page designed with a specific conversion goal: form submissions, phone calls, purchases, or downloads. In SEO, your landing pages are the pages you’re optimising to rank for target keywords. Every landing page should have a clear call to action and match the search intent of its target keyword.
Latent Semantic Indexing (LSI)
A mathematical method for understanding relationships between terms in content. In practice, “LSI keywords” has become shorthand for semantically related terms. If your page is about “renovation contractor Singapore,” related terms might include “HDB renovation,” “BCA licensed,” “interior design,” and “renovation loan.” Including these naturally demonstrates topical depth.
Link Building
The process of acquiring backlinks from other websites. Effective link building strategies include creating linkable assets, digital PR, broken link building, and building relationships with industry publications. In Singapore, local business directories (SgLocate, Streetdirectory), industry associations, and media outlets are valuable link sources.
Link Equity
The ranking value passed from one page to another through hyperlinks. Also called “link juice.” Not all links pass equal equity. Links from high-authority, relevant pages pass more value. Links with nofollow, sponsored, or UGC attributes pass reduced or no equity.
Local Pack
The map-based section showing three local business results at the top of search results for location-based queries. Appearing in the Local Pack for queries like “accountant near me” or “dental clinic Orchard Road” can drive significant foot traffic and calls. Google Business Profile optimisation is the primary lever here.
Log File Analysis
Examining your server’s access logs to see exactly how search engine bots crawl your site. This reveals which pages Googlebot visits most frequently, which pages it ignores, crawl frequency patterns, and response code issues. Tools like Screaming Frog Log Analyser and Botify make this manageable.
Long-Tail Keywords
Longer, more specific search phrases with lower search volume but higher conversion intent. “Shoes” is a head term. “Waterproof trail running shoes for women Singapore” is long-tail. Long-tail keywords typically convert 2-3 times better than head terms because the searcher knows exactly what they want.
M
Manual Action
A penalty manually applied by a Google reviewer (not algorithmic) for violating Google’s spam policies. You’ll be notified in Google Search Console. Common triggers include unnatural links, thin content, and cloaking. Recovery requires fixing the issue and submitting a reconsideration request.
Meta Description
The 150-160 character summary that appears below your title in search results. It doesn’t directly affect rankings, but it heavily influences click-through rate. Write meta descriptions that include your target keyword, communicate value, and compel the click. Think of it as your ad copy for organic search.
Metadata
Data about your webpage that helps search engines understand its content. This includes title tags, meta descriptions, meta robots tags, canonical tags, and Open Graph tags. Getting your metadata right is foundational on-page SEO.
Micro-Moments
Google’s term for intent-driven moments when users turn to their devices: “I want to know,” “I want to go,” “I want to do,” “I want to buy.” Understanding which micro-moment your target keyword serves helps you create content that matches intent precisely.
Mobile-First Indexing
Google predominantly uses the mobile version of your site for indexing and ranking. If your mobile site has less content than your desktop version, you’re hurting your rankings. Ensure content parity between mobile and desktop, and test your mobile experience regularly.
MozBar
A free browser extension from Moz that displays SEO metrics (DA, PA, spam score) directly in your browser and on search results pages. Handy for quick competitive analysis while browsing.
Multilingual SEO
Optimising your site for multiple languages. In Singapore’s multilingual context, this might mean creating content in English, Chinese, Malay, or Tamil. Each language version needs its own URL, proper hreflang tags, and native-quality translations (not machine translations).
N
NAP Consistency
Name, Address, Phone number consistency across all online platforms. For local SEO, your NAP must be identical everywhere: Google Business Profile, website, directories, social media. Even small differences (“St.” vs “Street,” “+65” vs “65”) can confuse Google and dilute your local ranking signals.
Natural Links
Backlinks earned without any outreach or solicitation. Someone found your content useful and linked to it. These are the most valuable type of backlinks because