SEO

SEO stands for search engine optimization. It is the work of making a website visible when people search for what a company offers, in Google and Bing, and in AI services like ChatGPT, Copilot, Perplexity and Google's AI Overviews.

The mechanics are simple to describe and demanding to master. Search engines move through the web, store what they find, and rank pages by how well they answer the query. SEO is the discipline of making your site the best answer, through technical work, content and authority.

This page is the entrance to our full knowledge hub, built on work with 1,000+ customers since 2017. First the big picture: what SEO is, how search engines and AI search work, and which disciplines the field is made of. After that you can go deep in six pillars that cover the whole field between them.

What is SEO?

Search engine optimization is the combined effort to make a website rank high in the organic results, the ones you do not pay per click for. Ads buy visibility for as long as the budget lasts. SEO builds visibility that keeps working: a page that ranks at the top for an important keyword can bring in customers every day for years with no additional media spend.

The reason position matters so much is the shape of the click curve. The first organic result takes roughly a third of the clicks on desktop, and the share falls steeply for every place you go down. On a normal result page, most of the clicks still go to the organic results rather than the ads around them.

That makes SEO one of the strongest channels in marketing. People who search took the initiative themselves: they are actively looking for an answer, a product or a supplier, and they trust the organic results more than the paid ones. Visibility creates visits. Visits create customers. Customers create growth.

In practice, SEO works on three fronts: the technical foundation of your website, the content you publish, and the authority your site earns through links and brand mentions. On top of those sits measurement, which ties the whole thing back to the business. All four are covered below, but the mechanics come first.

How a search engine works

A search engine does its job in three steps, and each step decides part of your visibility.

Crawling. The crawler (Google's is called Googlebot) moves through the web by following links from page to page, reading content as it goes. If the crawler cannot reach a page, or cannot read it, the page does not exist as far as the search engine is concerned, no matter how good the content is.

Indexing. What the crawler finds gets stored in an index: an enormous, structured library of the web's pages. Here the search engine works out what each page is about, which topics and entities it covers, and whether it is worth keeping at all. Not everything that gets crawled gets indexed.

Ranking. When someone searches, the engine pulls the relevant pages from the index and sorts them by hundreds of signals. The most important ones come down to three questions. Does the page match the search intent, meaning what the user is actually trying to achieve? Is the content strong and credible, the thing Google describes with the E-E-A-T quality framework of experience, expertise, authoritativeness and trustworthiness? And do other trustworthy sites point to the page with links, the web's version of a recommendation?

User experience sits alongside all three. Pages that load quickly and work properly on a phone have an advantage over pages that do not. SEO is the work of giving the search engine the right answer at every step, and that split is exactly what our pillars follow.

How AI search works

A growing share of searches gets answered by AI. ChatGPT, Copilot, Perplexity, Gemini and Google's AI Overviews hand the user a finished answer instead of a list of links. It can look like a completely different mechanism, but the family resemblance is obvious: the language models get their knowledge from the web, through training data and through live retrieval in the same indexes classic SEO is about, and they then choose which sources to build the answer on and cite.

So the same properties win on both surfaces. Content that is easy to crawl, clearly structured and professionally credible gets ranked high in Google and cited in AI answers. Sites with strong classic visibility turn up far more often among the sources when the AI services answer a question.

Classic search and AI search are one discipline: people looking for companies, and systems trying to give them the best answer. There are real differences in how you optimize for each surface, from how AI Overviews selects its sources to how you monitor what the models say about your brand, and the hub's AI search pillar covers those in detail.

The disciplines in SEO

The work falls into four main areas that feed each other:

• Technical. Make sure search engines can crawl, read and understand your site: architecture, speed, structured data.
• Content. Build pages that match search intent better than your competitors', from keyword research to finished text.
• Authority. Earn the links and brand mentions that show search engines other people trust you.
• Measurement. Follow visibility, traffic and conversions so the work can be prioritized by business value.

Our hub is built on six pillars that cover those four areas plus the fundamentals and the AI surfaces. Read them in order, or go straight to the area that matters most to you.

SEO fundamentals

The foundation: how search engines crawl, index and rank, how you set a strategy, and what terms like E-E-A-T, search intent and local SEO mean in practice. The beginner's guide lives here, along with the measurement hierarchy from visibility to revenue. Start here if you want to build the understanding from the ground up, or refresh it.

AI search

Visibility on the AI surfaces: AI Overviews, ChatGPT, Gemini, Copilot, Perplexity and Claude, how each one picks its sources, and how you monitor what the models say about you. Classic search and AI search are the same dynamic, and this is the half that fewest teams have a handle on.

Technical SEO

The engine room: crawling and indexing, site architecture, Core Web Vitals, structured data, JavaScript rendering and everything else that decides whether search engines can read and understand your site at all. Technical work rarely wins rankings on its own, but without it nothing else wins either.

Content strategies

The content that has to be found: keyword research, semantic SEO, competitor analysis, internal link building and conversion. This is the method behind content that builds relationships with future customers, from choosing the topics to writing pages that both rank and sell.

Link building

Authority from the outside: link analysis, digital PR and anchor text strategy. Your links should not look natural, they should be natural, and this pillar holds the method behind brand mentions and backlinks you earn, from sites that carry weight.

SEO tools, data and algorithms

The measurement side: ranking factors, algorithm updates, tracking visibility across both Google and the AI surfaces, and reporting your business can act on. Including the best free tools for the whole range.

How to get started

The best starting point is an honest picture of where you stand. Which keywords do you rank for, how healthy is the site technically, and what do the AI models say about you when your customers ask? With that overview you can prioritize by value instead of instinct, and the quickest wins usually sit on pages already ranking in the middle of page one rather than in brand new topics.

If you want that overview handed to you, our free SEO analysis is built for exactly this: put together by hand by a specialist, never auto-generated, and looking at both classic search and AI search. We have completed 3,000+ of them, and it gives you a concrete place to start.

And if you want hands on the work, our 40+ specialists in Copenhagen, Stockholm and Oslo are ready. See how we work across the whole field, from technical SEO to content and link building, in our services.