What is the difference between SEO, AEO, GEO and AIO?

SEO: ranking in the list of search results

This is the oldest of the concepts. The goal is to sit near the top of the list of blue links that appears when someone types a search term. Title and description tags, site structure, links, loading speed and the depth of the content are what the ranking is based on.

There is one important precondition. Ranking only matters after a page has been indexed. A page that has not even been indexed cannot compete for a ranking.

Patients use different words for each specialty, so each specialty needs different pages. For dentistry and internal medicine (both in Korean), we measured actual search terms and laid out which pages are needed first.

AEO: being picked as the answer to a question

Answer Engine Optimization. It targets the area at the very top of the search results where the answer to a question is shown directly. It responds to the pattern of users getting their answer without clicking a link.

The key is document structure. Using the question as the heading and placing a two- or three-sentence conclusion right below it works best. Writing that saves the conclusion for the end feels natural to people but works against answer engines.

GEO: being cited in generative AI answers

Generative Engine Optimization. The goal is to have generative engines such as ChatGPT, Perplexity and Google AI Overviews list our document as a source when they compose an answer.

AI reads several documents and synthesizes an answer. So rather than sentences like "We are the best," it picks sentences with clear facts that cannot be wrong when quoted. Documents that state figures, conditions and ranges clearly have the advantage.

• Arrange content as question, then conclusion, then supporting detail
• Cover only one topic per document
• Use structured data to state what kind of document it is and who wrote it
• Check in robots.txt that AI crawlers can access the site

AIO: the umbrella term over all three

It is used as short for AI Optimization or AI Search Optimization. The industry has not fully settled on a definition, and depending on context it is sometimes used to mean almost the same as GEO.

In practice, rather than separating the terms, everything converges on the same answer: create documents that are clear for people to read and clearly structured for machines to read.

What needs to be done differently

The technical elements (meta tags, structured data, sitemaps, speed) are needed for all four. WiSite handles this part automatically when a site is created.

Where they differ is the form of the content. If you only aim for rankings, long keyword-centered writing used to work. If you aim to be the answer or be cited, documents that give one precise answer to one question work better.