“TF*IDF” refers to “Term Frequency * Inverse Document Frequency.” It’s an indicator that compares the frequency of a word on a web page (Term Frequency) to its relative rarity among all existing web pages (Inverse Document Frequency). Considering TF*IDF goes beyond a simple word frequency analysis. This indicator is used to evaluate the relevance of a web page on a specific topic, based on a user’s online search query.