What does SEO mean?
SEO means search engine optimisation. In plain words, SEO is everything you do to make a website easier for search engines to find, understand and trust, so that it shows up when people search for what you offer.
When someone types "plumber in Pretoria" or "how to fix a leaking geyser" into Google, Google looks through the pages it has stored and ranks them by how well they answer that search. SEO is the practice of making your pages the best, most trustworthy answer.
The results you earn this way are called organic results. They sit below or beside the paid ads, and you don't pay Google when someone clicks them. That is the main difference between SEO and paid search (see SEO vs SEM vs PPC).
How does SEO work?
Search engines like Google work in three steps, and SEO supports each one:
- Crawling: Google's crawler (Googlebot) follows links to discover pages. SEO makes sure your pages can be found: a clean site structure, an XML sitemap and internal links.
- Indexing: Google reads each page and stores it in its index. SEO makes sure pages load, aren't blocked, aren't duplicated and clearly say what they are about.
- Ranking: when someone searches, Google orders indexed pages by relevance and quality. SEO improves the signals Google uses: helpful content that matches the search intent, page experience, and links and mentions from other trusted sites.
Google uses hundreds of signals, but they fall into three big groups: relevance (does the page answer this search?), quality and trust (is it accurate, experienced and reliable, often summarised as E-E-A-T) and usability (does it load quickly and work on a phone?).
The main types of SEO
| Type of SEO | What it covers | Guide |
|---|---|---|
| On-page SEO | Content, titles, meta descriptions, headings, images and internal links on each page | On-page SEO |
| Technical SEO | Crawling, indexing, site speed, mobile-friendliness, HTTPS, structured data | Technical SEO |
| Off-page SEO | Backlinks, brand mentions, reviews and reputation outside your website | Backlinks |
| Local SEO | Google Business Profile, Google Maps and "near me" searches | Local SEO |
| Content SEO | Planning and writing pages and blog posts people search for | SEO writing |
| E-commerce SEO | Category and product pages for online stores | E-commerce SEO |
| AI search optimisation (GEO/AEO) | Being cited in AI Overviews, ChatGPT and other AI answers | AI SEO |
You may also hear about white hat SEO (following Google's guidelines) and black hat SEO (tricks like buying links or keyword stuffing that break the guidelines and risk a penalty). We only recommend white hat SEO.
What is SEO in digital marketing?
In digital marketing, SEO is the organic search channel. It sits alongside paid search (Google Ads), social media, email and content marketing. SEO's role is to capture people who are already searching for your product, service or topic, which makes it one of the highest-intent sources of traffic a business can have.
SEO and content marketing overlap heavily: content gives people something worth finding, and SEO makes sure it gets found. SEO also supports paid campaigns, because a well-structured website improves Google Ads quality scores and conversion rates.
Why is SEO important?
- People search before they buy. Most buying journeys, from choosing a dentist to comparing car insurance, start with a search.
- Organic clicks don't cost per click. Once a page ranks, it keeps bringing visitors without paying Google for each one.
- It compounds. Good content and links keep working for months or years, unlike ads that stop when the budget stops.
- Trust. Many people skip ads and trust organic results more.
- It improves the whole website. Faster pages, clearer content and better structure help every visitor, not just Google.
For South African businesses, local SEO matters especially: showing up in the Google Maps "map pack" for searches like "SEO company Johannesburg" or "attorney near me" drives calls and walk-ins directly.
How to start doing SEO
- Set up Google Search Console and Google Analytics so you can see how people find you.
- Do keyword research: list what your customers search for and which page should answer each search.
- Fix the basics on each page: a clear title tag, meta description, one H1 and helpful content (on-page SEO).
- Check your site can be crawled and loads fast on mobile (technical SEO).
- Claim and complete your Google Business Profile if you serve local customers (local SEO).
- Publish useful content regularly and earn links from relevant sites (link building).
- Measure progress monthly (SEO reporting) and be patient: SEO takes months, not days.
Want a head start? Try our free SEO content analyser and SERP snippet preview, or request a free audit.
Questions answered
What does SEO stand for?
SEO stands for search engine optimisation (optimization in US spelling). It means improving a website so it ranks higher in unpaid search results on Google, Bing and other search engines.
What is SEO in simple words?
SEO is making your website the best answer to what people search for, so Google shows it near the top of the results and more people visit it.
What is an SEO website?
An "SEO website" or SEO-friendly website is one built so search engines can crawl, understand and rank it: fast, mobile-friendly, with clear page titles, helpful content and a logical structure.
How does SEO work step by step?
Search engines crawl pages by following links, index what they find, then rank indexed pages for each search. SEO makes pages easy to crawl, clear to index and strong enough to rank through relevant content, good page experience and links from trusted sites.
What are the 3 main types of SEO?
The three core types are on-page SEO (content and page elements), technical SEO (crawling, indexing, speed, mobile) and off-page SEO (backlinks and reputation). Local SEO is often treated as a fourth type.
What are the 4 or 5 pillars of SEO?
Most frameworks list technical SEO, on-page SEO, content, off-page SEO (links and authority) and user experience. Local SEO is added for businesses serving specific areas.
Is SEO still worth it in 2026?
Yes. People still search billions of times a day, and AI search features such as Google's AI Overviews draw on well-ranked, trustworthy pages. SEO now also includes making your content easy for AI answers to cite.
Can I do SEO myself?
Yes. The basics (keyword research, good page titles, helpful content, a Google Business Profile and a fast mobile site) can be done by a business owner. Competitive markets, technical problems and link building usually need a specialist.
What is the difference between SEO and Google Ads?
SEO earns unpaid (organic) rankings that take time to build but don't cost per click. Google Ads buys placement instantly, and you pay for every click. Many businesses use both.
Is SEO free?
The clicks from organic results are free, but SEO itself takes time or money: writing content, fixing technical issues and building links. It is usually cheaper per lead than ads over the long term.
What does an SEO do?
An SEO specialist researches keywords, improves website content and structure, fixes technical issues, builds links and reports on rankings and traffic. See our guide to SEO careers.
What is organic SEO?
Organic SEO means earning unpaid search rankings through content, technical improvements and links, as opposed to paid search ads.
What is SEO in marketing?
In marketing, SEO is the organic search channel: attracting people who are already searching for your product or service, without paying per click.
What is an SEO keyword?
An SEO keyword is a word or phrase people type into a search engine, such as "seo company cape town". Pages are optimised around keywords so they match what people search for. See keyword research.
What is white hat vs black hat SEO?
White hat SEO follows Google's guidelines (helpful content, genuine links). Black hat SEO uses manipulative tricks such as buying links, cloaking or keyword stuffing, which can get a site penalised or removed from Google.