How does SimilarWeb categorize domains?

Each website in SimilarWeb is categorized based on SimilarWeb categorization engine - and a few awesome interns. Our code assigns a category for any website using content tags, similarity results and a learning set of millions of websites that have verified category assignments.

Our engine can accurately classify an unknown website into one of 25 main categories and 219 sub-categories. You can see the full list here.