TF-IDF is calculated by multiplying term frequency and inverse document frequency. TF-IDF = TF * IDF. TF: Number of times a word appears in a document/number of words in the document.

Learn what TF-IDF is, how it works, why it’s part of the SEO lexicon, and most importantly – whether Google uses it as a ranking factor.

TF-IDF, short for term frequency–inverse document frequency, identifies the most important terms used in a given document. It is also one of the most ignored content optimization tools used by ...