Guide
What is SEO? Search engine optimisation explained for business owners
SEO (search engine optimisation) is the work of making a website more visible in the unpaid results of search engines such as Google and Bing — and, increasingly, in the answers generated by AI assistants. This guide explains what it means, how it works and what it involves, without the jargon.
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Key takeaways
3
pillars: technical, content, authority
0
cost per click on organic traffic
3–6
months to competitive rankings
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SEO meaning and definition
Search engine optimisation is everything you do to help a search engine find, understand and trust your website so that it shows your pages to people searching for what you offer. Unlike paid advertising, you do not pay per click; you earn the position by being the most relevant and credible result. “Organic search” is the name for this unpaid traffic.
How search engines work
A search engine does three things. It crawls the web by following links and reading pages. It indexes what it finds, storing a copy of each page along with what it is about. When someone searches, it ranks pages from its index by hundreds of signals — relevance to the query, quality of the content, the authority of the site, speed, mobile usability, and user behaviour — and shows the best matches. SEO works on each stage: making sure pages can be crawled and indexed, and giving the ranking systems reasons to prefer yours.
The three pillars of SEO
- Technical SEO: site structure, speed, mobile usability, crawlability and indexation — the foundations. See our technical SEO service.
- On-page SEO and content: pages that match what searchers want, well structured, with clear titles, headings and internal links. See on-page SEO.
- Off-page SEO: authority earned from other sites — links, mentions, reviews. See link building.
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Types of SEO you will hear about
- Local SEO: appearing in Google Maps and local results for searches in a specific area. See what is local SEO.
- Ecommerce SEO: optimising online shops, categories and product pages. See ecommerce SEO.
- International SEO: ranking across countries and languages. See international SEO.
- White hat vs black hat SEO: methods that follow search engine guidelines versus those that try to manipulate them. See ethical SEO.
- AI SEO / GEO / AEO: optimising to be cited in AI-generated answers. See AI search optimisation.
Why SEO matters for a business
Search is where people go with intent. Someone typing “emergency plumber Southampton” or “best accounting software for small business” is telling you exactly what they want. Ranking for those searches brings customers who are already looking, at no cost per click, month after month. For most UK businesses it is the highest-return marketing channel over any period longer than a year.
How long does SEO take, and what does it cost?
Technical fixes and local improvements can show results within weeks. Competitive organic rankings typically take three to six months to build and continue improving after that. Costs range from the time of a founder doing the basics to agency retainers; ours are published on the pricing page. For how to pick help, see how to choose an SEO agency.
Where to start
Set up Google Search Console and Google Analytics. Make sure your site is fast and works on a phone. Write one clear page for each product or service you sell, with a title that says what it is. Claim your Google Business Profile if you serve a local area. Then read our SEO strategy guide for what comes next.
FAQ
Frequently asked questions
What does SEO stand for?
Search engine optimisation (or optimization in US spelling).
Is SEO free?
Organic search clicks are free, but the work to earn them — content, technical fixes, authority — costs time or money.
What is the difference between SEO and SEM?
SEM usually refers to paid search advertising; SEO is the unpaid, organic side. Some people use SEM to mean both.
Does SEO still work with AI search?
Yes. AI Overviews and assistants draw on the same web pages; well-structured, authoritative content is what gets cited. See our AI SEO service.
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