This document provides an overview and comparison of PageRank algorithms. It begins with a brief history of PageRank, developed by Larry Page and Sergey Brin as part of the Google search engine. It then discusses variants like Weighted PageRank and PageRank based on Visits of Links (VOL), which incorporate additional factors like link popularity and user visit data. The document also gives a basic introduction to web mining concepts and categorizes web mining into content, structure, and usage types. It concludes with a comparison of the original PageRank algorithm and its variations.