Co-occurrence describes, in SEO, the joint appearance of certain terms within a text or across several web pages. When two words are frequently mentioned together, Google recognises that there is a thematic connection between these terms.
This allows the search engine to understand content better, even if a particular keyword is not repeated exactly all the time.
How does co-occurrence work?
Google analyses not only individual keywords, but also the context around a topic. When certain terms regularly appear together, this can help to classify the relevance of a piece of content more accurately.
An example:
If terms such as ”SEO”, ”backlinks”, ”keywords” and ”Google” appear frequently on a page, Google recognises that the content probably deals with search engine optimisation.
Typical co-occurrence terms for ”SEO” would be, for example:
- keywords
- rankings
- search engine
- backlinks
- content
Why co-occurrence is important for SEO
Modern search engines work in an increasingly semantic way. This means it is no longer enough to repeat a keyword as often as possible.
It is better to cover a topic comprehensively and to include relevant terms naturally in the text. This helps Google and AI systems understand better what a page is about.