What is SEO?
SEO, or search engine optimization, is the practice of improving a website so it appears higher in unpaid search results on Google, Bing and AI search tools, bringing more relevant visitors.
SEO covers several areas: technical SEO makes the site easy to crawl and fast, on-page SEO matches content to what people search, off-page SEO builds authority through links and mentions, and local SEO helps businesses appear in map results.
Search now includes AI answers too. Modern SEO also aims to be cited in Google AI Overviews, ChatGPT, Perplexity and other assistants, sometimes called AEO or GEO.
The main types of SEO
| Type | Focus | Examples |
|---|---|---|
| Technical SEO | How search engines crawl, render and index your site | Speed, sitemaps, canonicals, schema |
| On-page SEO | Content and HTML of each page | Titles, headings, internal links, copy |
| Off-page SEO | Signals from other sites | Backlinks, digital PR, mentions, reviews |
| Local SEO | Visibility in nearby and map searches | Business Profile, citations, location pages |
| Content SEO | Creating pages that answer searches | Guides, service pages, topic clusters |
| AI search optimisation | Visibility in AI Overviews and chat tools | Clear answers, entities, trusted sources |
How search engines rank pages
- 1Crawling: bots discover pages by following links and reading sitemaps.
- 2Rendering: the page is loaded like a browser to see its final content.
- 3Indexing: the content is analysed and stored in the search index.
- 4Ranking: for each search, systems weigh relevance, quality, usability and context such as location.
- 5Serving: results are shown with features like snippets, maps and AI Overviews.
How long SEO takes
Most sites see early movement within 3 to 6 months and stronger results in 6 to 12 months. Timelines depend on competition, how much work the site needs, its existing authority and how consistently improvements are made. Local businesses in smaller markets often see results faster than national brands in crowded markets.
SEO for different business types
Local businesses
Google Business Profile, reviews, local pages and citations.
Online stores
Category and product optimisation, technical health and feeds.
B2B companies
Decision stage content, comparisons and thought leadership.
How SEO works in simple terms
SEO, or search engine optimisation, is the work of helping a website appear higher in search results for searches that matter to the business. Search engines crawl the web, index pages and rank them by relevance, quality and authority. SEO improves each of these: making pages easy to crawl, matching content to what people search and building trust through links, reviews and expertise.
Good SEO brings steady, free traffic from people actively looking for what you offer. It takes time, but results compound as pages build authority.
Core SEO tasks
- 1Research the keywords customers use.
- 2Fix technical issues such as speed and indexing.
- 3Create useful pages for each service, product or question.
- 4Optimise titles, headings and internal links.
- 5Earn links and mentions from trusted sites.
- 6Manage local listings and reviews for local businesses.
- 7Track rankings, traffic and conversions.
SEO and AI search
AI Overviews
Google's AI summaries cite pages that answer clearly and accurately.
Answer engines
Tools like ChatGPT and Perplexity draw on well structured, trusted content.
Same foundations
Quality content, clear structure and authority help in both.
SEO checklist for beginners
- 1Search Console and analytics set up.
- 2Keyword list for main services.
- 3Unique titles and descriptions.
- 4Fast, mobile friendly pages.
- 5Google Business Profile for local businesses.
- 6Useful content for common questions.
Measuring SEO results
Track organic clicks, rankings for key terms, leads or sales from organic search and growth in non branded traffic. Review monthly and compare with the same period last year.
Why SEO matters for SEO
Organic search is often the largest source of website traffic, and visitors come with intent, actively looking for what you offer.
Unlike ads, organic traffic does not stop when you stop paying. Strong rankings built over time keep bringing visitors and leads at a lower cost per customer.
How SEO works
SEO works by improving three things search engines look for.
Crawlability
Search engines must be able to find, crawl and index your pages without technical barriers.
Relevance
Pages must match the words and intent behind searches, with clear, useful content.
Authority
Links, reviews, mentions and expertise show that your site deserves trust.
A small accounting firm gets most clients from referrals. After a year of SEO covering technical fixes, service pages for each specialism, local SEO and a few quality links, organic search becomes its largest source of new clients.
SEO checklist
- ✓Start with a technical audit
- ✓Research what customers actually search
- ✓Build helpful pages for each service and topic
- ✓Earn links and mentions from relevant sites
- ✓Optimise your Google Business Profile if you serve locally
- ✓Measure leads and revenue, not just rankings
Common SEO mistakes
Expecting instant results
SEO usually takes months to build momentum.
Chasing shortcuts
Paid links and keyword stuffing can backfire.
Ignoring user experience
Slow, confusing sites lose rankings and customers.
Not measuring results
Without tracking, it is hard to know what works.
Related SEO terms
SEO FAQs
What does SEO stand for?
+
Search engine optimization.
Is SEO better than paid ads?
+
They work best together. SEO builds long term traffic, while ads bring instant visibility.
Does SEO work for AI search?
+
Yes. Clear, trusted content helps you appear in AI answers too.
Is SEO a one time task?
+
No. Search results, competitors and algorithms change, so SEO needs ongoing work.
Does SEO work for new businesses?
+
Yes. Start with local SEO, a strong Google profile and pages for core services, then build content and links.
How long does SEO take?
+
Most sites see early progress in two to four months and stronger results in six to twelve.
Can I do SEO myself?
+
Yes, for basics. Competitive markets often need specialist help.
How much does SEO cost?
+
Costs vary by market and goals, from a few hundred to several thousand dollars a month.
What is the difference between SEO and SEM?
+
SEO covers organic results, while SEM usually refers to paid search ads, sometimes including SEO.
What is technical SEO?
+
Technical SEO covers crawling, indexing, speed, mobile usability and structured data, making sure search engines can access and understand a site.