SEO (search engine optimisation) is improving a website so search engines can find, understand and rank its pages for relevant searches. It rests on three pillars: technical health (crawlable, fast, secure pages), helpful content that matches search intent, and authority from links and reputation. In 2026, good SEO also supports visibility in AI-generated answers.
How search engines work
- Crawling: bots discover pages by following links and reading sitemaps.
- Indexing: the search engine stores and understands page content.
- Ranking: for each search, it orders results using many signals, including relevance, quality, usefulness and page experience.
SEO helps at every stage.
Pillar 1: Technical SEO
- Pages can be crawled and indexed (no accidental blocking).
- Clean URLs, logical site structure and internal links.
- XML sitemap and correct canonical tags.
- Fast loading and good Core Web Vitals.
- Mobile-friendly design.
- HTTPS security.
- Structured data (schema markup) to describe content.
Pillar 2: Content
- Understand search intent: is the searcher learning, comparing or buying?
- Answer the question clearly and early, then add depth.
- Organise content into topic clusters: a main page linked to detailed supporting pages.
- Avoid keyword cannibalisation: several pages competing for the same query. Merge or differentiate them.
- Update content when facts change.
Pillar 3: Authority
- Links from relevant, reputable websites.
- Brand mentions and reviews.
- Real expertise and experience, shown through author information and original insight.
E-E-A-T
Google's quality guidelines describe experience, expertise, authoritativeness and trustworthiness. Pages written by people with real experience, citing evidence and being transparent about who is behind the site, tend to perform better, especially for health, finance and education topics.
Local SEO
For businesses serving local customers: an accurate Google Business Profile, consistent name, address and phone details, local reviews and location pages with genuine information.
SEO in the age of AI search
Search results now include AI-generated overviews, and people also ask AI assistants directly. Clear, well-structured, trustworthy content helps you appear both in traditional rankings and as a cited source. See AEO vs SEO and what is GEO.
How to start
Set up Google Search Console, fix technical errors, research what your audience searches, and publish genuinely helpful content consistently. Our digital marketing and SEO course teaches this on live websites.
Frequently asked questions
How long does SEO take to work?
Often several months, depending on competition and site history. SEO is a long-term investment.
Can I do SEO myself?
Yes, the fundamentals are learnable. Larger or competitive sites benefit from specialists.
Is SEO dead because of AI?
No. Search is evolving, but discoverable, trustworthy content remains essential, and AI systems rely heavily on web content.
