The TF*IDF formula provides an overview of terms that other websites, which rank for this keyword, use on their page.
It is calculated for every document (i.e. page) and term individually and takes into account how often terms are used within the documents that rank in Google for the focus keyword. That means that our tool returns a list of keywords you might want to consider using on your page as well. You should only follow the TF*IDF recommendations as long as they make sense for your particular content, though.
With the TF*IDF formula, you can identify in which proportion certain terms within a text document or website are weighted compared to all potentially possible documents. This formula can be used for on-page optimisation in order to increase a website’s relevance in search engines.
Further information: