This document summarizes the history and evolution of search engines from the early 1990s to present day. It discusses the first search engines like Archie, Veronica, and Jughead and how they indexed early internet content. It then explains why Google became dominant by providing more relevant and faster search results using PageRank and analyzing link structure. The document outlines Google's original and subsequent algorithms and ranking factors for organic and local search results. It also notes Google's use of over 200 signals and semantic analysis to continuously improve search relevancy.