These concepts can be identified as keyword density-based analyzes that help Google make sense of content as well as the quality of content. In short, these are used to make inferences about the frequency of use of keywords in the content. It is possible to analyze the density of a keyword in website content with TF (Term Frequency), while the IDF (Inverse Document Frequency) is used to analyze how many different pieces of content a keyword is used in. For example, webmasters can use TF and IDF to analyze the content appearing on the first page of the query of the respective keyword and compare them with the content they created. After analyzing how frequently the keyword was used on the pages ranking on the first page, improvements or corrections can be made on the created content.