SEO

13 min read

SEO

Search Engine Optimisation — the practice of structuring your website so that search engines can understand it, index it, and show it to the right people at the right time.

What is it?

When someone types a question into Google, the results that appear are not random. Search engines send automated programs called crawlers to follow links across the web, discover pages, and build a massive index of what exists and what it is about. When a user searches, an algorithm evaluates hundreds of factors to decide which indexed pages are most relevant, most trustworthy, and most useful — and ranks them accordingly.1

SEO is the discipline of making your website work well within this system. It is not a trick. It is not gaming an algorithm. At its core, SEO is communication: helping search engines understand what your site is about, and helping users find what they need.2

Google’s own starter guide puts it bluntly: “compelling and useful content” influences your search presence more than any technical trick. Keyword density, meta keyword tags, and exact word counts have minimal ranking impact. What matters is that your content genuinely serves the person searching for it.2

For anyone building a website — whether a community platform, a small business site, or a knowledge base — SEO is not optional. Organic search is typically the largest single source of website traffic. If search engines cannot understand your site, people cannot find it.

In plain terms

SEO is like putting a clear sign on your shop front. The shop (your website) might have exactly what someone needs, but if the sign is missing, misspelled, or facing the wrong direction, nobody walks in. SEO is the sign, the address in the directory, and the helpful person at the door who says “yes, we have what you’re looking for.”

At a glance

How does it work?

The three pillars

SEO is traditionally divided into three pillars. Each addresses a different dimension of the same goal: making your site discoverable and useful.3

graph TD
    SEO[SEO] --> T[Technical SEO]
    SEO --> ON[On-Page SEO]
    SEO --> OFF[Off-Page SEO]
    T --> SP[Site Speed]
    T --> MO[Mobile-Friendly]
    T --> SD[Structured Data]
    ON --> CQ[Content Quality]
    ON --> KW[Keywords]
    ON --> IL[Internal Links]
    OFF --> BL[Backlinks]
    OFF --> AU[Authority]

    style SEO fill:#4a9ede,color:#fff

Technical SEO — can search engines read your site?

Technical SEO ensures that crawlers can access, understand, and index your pages. If the technical foundation is broken, nothing else matters — the best content in the world is invisible if search engines cannot reach it.4

FactorWhat it meansWhy it matters
Site speedHow fast your pages loadA 1-second delay in load time reduces conversions by 7%. Core Web Vitals directly affect ranking.5
Mobile-friendlyWorks well on phones and tabletsOver 60% of web traffic is mobile. Google uses mobile-first indexing.
CrawlabilitySearch engines can follow links and read pagesBroken links, missing sitemaps, and blocked pages prevent indexing
HTTPSSecure connectionGoogle flags non-HTTPS sites as insecure; it is a ranking signal
Structured dataSchema markup that tells search engines what your content isEnables rich results (ratings, FAQs, events) and helps AI systems understand your site6

Think of it like...

Technical SEO is like building a shop with a proper address, an unlocked door, clear aisle signs, and lights that work. You can have the best products in the world, but if customers cannot find the entrance or navigate the store, they leave.

On-page SEO — does your content serve the searcher?

On-page SEO is about the content itself: what you write, how you structure it, and whether it matches what the person searching actually wants.3

Search intent is the most important concept here. Every search query has an intent behind it:

Intent typeWhat the user wantsExample query
InformationalLearn something”what is SEO”
NavigationalFind a specific site”Google Search Console login”
TransactionalDo something or buy”buy domain name”
CommercialCompare before deciding”best website builders 2026”

If your page targets the wrong intent — offering a product page when the user wants information, or a tutorial when they want to buy — it will not rank, regardless of quality.7

Practical on-page checklist:

  • Title tag — clear, descriptive, under 60 characters, includes the primary keyword naturally
  • Meta description — 1-2 sentences that tell the searcher what they will find (not a ranking factor, but affects click-through rate)
  • Headings — logical H1/H2/H3 hierarchy that structures the content for both readers and crawlers
  • Internal links — connect related pages so users and crawlers can navigate your site
  • Content quality — genuinely useful, answers the question, written for people not algorithms

Off-page SEO — does the web trust your site?

Off-page SEO is about what other sites say about yours. The core signal is backlinks — when another website links to yours, it functions as a vote of confidence. Not all votes are equal: a link from a respected news site carries far more weight than a link from a random blog.3

For small sites, the most effective off-page strategy is not “link building” as a technical exercise but creating content worth linking to. Original research, useful tools, comprehensive guides, and unique data naturally attract links because other sites want to reference them.8

What to avoid

Link farms, purchased backlinks, and link exchange schemes do not work. Google has been penalising these practices for over a decade. The short-term gain is not worth the long-term damage to your site’s credibility.

E-E-A-T: the trust framework

Google evaluates content quality through a framework called E-E-A-T: Experience, Expertise, Authoritativeness, and Trustworthiness.9

FactorWhat it meansHow to demonstrate it
ExperienceFirst-hand knowledge of the topicShare personal experience, real examples, original photos
ExpertiseDeep knowledge in the subject areaCredentials, depth of content, accuracy
AuthoritativenessRecognised as a go-to sourceBacklinks, citations, media mentions
TrustworthinessReliable and honestHTTPS, clear authorship, accurate information, transparent about who you are

E-E-A-T is not a ranking algorithm — it is a set of guidelines that Google’s human quality raters use to evaluate search results. But it reflects what the algorithm is designed to reward: content from people who demonstrably know what they are talking about.9

This matters especially now. As AI-generated content floods the web, Google increasingly prioritises content that shows real experience and genuine expertise. The first “E” (Experience) was added in December 2022 specifically to distinguish content from people who have done the thing from content generated by someone (or something) that has not.9

SEO in the age of AI

The search landscape is shifting. Google’s AI Overviews now appear in approximately 26% of US searches, generating answers directly on the results page.10 Zero-click searches — where the user gets their answer without clicking through to any website — now account for 58.5% of searches in the US.11

graph LR
    Q[User Query] --> AI{AI Overview?}
    AI -->|yes, 26%| AO[AI-Generated Answer]
    AI -->|no| OR[Organic Results]
    AO -->|cited source| C[Your Site Gets Traffic]
    AO -->|not cited| Z[Zero Click]

    style AO fill:#e8b84b,color:#fff
    style Z fill:#e74c3c,color:#fff
    style C fill:#5cb85c,color:#fff

What this means for builders:

  • The goal is shifting from “rank #1” to “be the source AI cites.” Pages cited within AI Overviews see click-through rate increases up to 35%.10
  • Quality visitors matter more than volume. Research by BrightEdge suggests that 1,000 visitors from AI search produce roughly the same conversions as 23,000 from traditional organic search.11
  • Structured data helps AI understand you. Google confirmed in April 2025 that structured data gives an advantage for AI Overview citations. Microsoft confirmed the same for Copilot.6
  • The fundamentals still work. Fast site, clear content, genuine expertise, good structure. The path to being cited by AI is the same path that has always worked for ranking well: be the most useful, most trustworthy source on the topic.

The AI-era SEO principle

AI does not replace SEO. It raises the bar. Content that was “good enough” to rank on page one may not be good enough to be cited by an AI Overview. The winners are sites with genuine expertise, clear structure, and content that demonstrably serves the user better than the AI-generated summary alone.

Why do we use it?

Key reasons

1. Organic search is the largest traffic source for most websites. If people cannot find your site through search, your audience is limited to whoever you can reach through paid ads or social media — both of which stop working the moment you stop paying.1

2. SEO compounds over time. A well-optimised page continues to attract traffic for months or years. Every new page you add strengthens the whole site. This compounding effect is especially valuable for small teams with limited budgets.8

3. It forces you to think about your users. The practice of SEO — understanding search intent, writing clear titles, structuring content logically — makes your site better for everyone, not just search engines. Good SEO and good user experience are largely the same thing.

When do we use it?

  • When building a public-facing website that you want people to discover through search
  • When writing content (articles, guides, documentation) that should be findable
  • When choosing a technical architecture for a new site — SEO considerations (server-side rendering, page speed, URL structure) should inform the choice
  • When launching a product or service and need organic traffic as a growth channel
  • When reviewing an existing site that is not getting the traffic you expect

Rule of thumb

If your site is public and you want people to find it, SEO applies. If your site is private, internal, or behind a login, SEO does not apply to those pages — but your public landing pages still need it.

How can I think about it?

The library analogy

A library organises books with clear titles, catalogue entries, shelf labels, and a classification system. SEO does the same for your website. The title tag is the book’s title on the spine. The meta description is the blurb on the back cover. Headings are the chapter titles. Internal links are the cross-references. Structured data is the catalogue card that tells the librarian exactly what the book is about, who wrote it, and where it belongs.

A book with no title, no catalogue entry, and no shelf label exists in the library but nobody can find it. A website with no SEO exists on the internet but nobody can find it.

  • Title tag = book title on the spine
  • Meta description = back cover blurb
  • Headings = chapter titles
  • Internal links = cross-references
  • Structured data = catalogue card
  • Backlinks = other books citing yours in their bibliography

The shop front analogy

Imagine you open a shop on a busy street. Technical SEO is the foundation: the address is listed in directories (Google Search Console), the door is unlocked (crawlable), the lights are on (fast loading), and there is a wheelchair ramp (accessible). On-page SEO is what is in the window: clear signage (title tags), products that match what passers-by are looking for (search intent), and a logical layout inside (headings and internal links). Off-page SEO is your reputation on the street: other shop owners recommend you (backlinks), local newspapers mention you (authority), and satisfied customers tell their friends (social signals).

  • Address in directories = sitemap submitted to Google
  • Unlocked door = pages crawlable, not blocked by robots.txt
  • Window display = title tags and meta descriptions
  • Logical layout = heading structure and internal linking
  • Recommendations from other shops = backlinks

Concepts to explore next

ConceptWhat it coversStatus
frontendThe part of a website users see and interact with — where SEO happenscomplete
structured-data-vs-proseHow structured formats help machines understand contentcomplete
machine-readable-formatsJSON, YAML, and other formats that bridge human and machine understandingcomplete
core-web-vitalsThe three metrics Google uses to measure page experiencestub
structured-dataSchema markup that tells search engines what your content isstub
search-intentUnderstanding what the user actually wants when they searchstub

Some of these cards don't exist yet

They’ll be created as the knowledge system grows. A broken link is a placeholder for future learning, not an error.

Check your understanding

Where this concept fits

Position in the knowledge graph 

graph TD
    SD[Software Development] --> WD[Web Development]
    WD --> FE[Frontend]
    FE --> SEO[SEO]
    SEO --> CWV[Core Web Vitals]
    SEO --> SCHEMA[Structured Data]
    SEO --> SI[Search Intent]
    SEO -.->|uses| SDP[Structured Data vs Prose]
    SEO -.->|uses| MRF[Machine-Readable Formats]
    style SEO fill:#4a9ede,color:#fff

Related concepts:

  • frontend — SEO is implemented primarily in the frontend layer: meta tags, headings, page speed, and rendering strategy
  • structured-data-vs-prose — structured data (schema markup) helps search engines and AI systems understand content that prose alone cannot convey
  • machine-readable-formats — JSON-LD, the format used for schema markup, is a machine-readable format that bridges human content and search engine understanding

Sources

Further reading

Resources

Footnotes

  1. Search Engine Land. (2026). What Is SEO — Search Engine Optimization?. Search Engine Land. ↩ ↩2

  2. Google. (2026). SEO Starter Guide. Google Search Central. ↩ ↩2

  3. Copy.ai. (2026). Master the Three Pillars of SEO. Copy.ai. ↩ ↩2 ↩3

  4. The HOTH. (2026). The Ultimate Technical SEO Checklist for 2026. The HOTH. ↩

  5. White Label Coders. (2026). How Important Are Core Web Vitals for SEO in 2026?. White Label Coders. ↩

  6. Search Engine Land. (2025). Schema Markup and AI Search. Search Engine Land. ↩ ↩2

  7. SEO.com. (2026). The 8 Top SEO Mistakes to Avoid in 2026. SEO.com. ↩

  8. Entrepreneur. (2025). 5 Powerful SEO Strategies for Small Businesses. Entrepreneur. ↩ ↩2

  9. Iconier. (2026). AI-Generated Content and SEO: 2026 Best Practices. Iconier. ↩ ↩2 ↩3

  10. Stackmatix. (2026). Google AI Overview SEO Impact: 2026 Data and Statistics. Stackmatix. ↩ ↩2

  11. Click Vision. (2025). Zero-Click Search Statistics. Click Vision (citing Semrush 2025 study). ↩ ↩2

Graph View

Backlinks