This document provides an overview of Search Engine Optimization (SEO), explaining its importance in enhancing a website's ranking on search engines like Google, Yahoo, and Bing. It outlines the history of search engines, how they function, the types of SEO (on-page and off-page techniques), and tools that can assist in the optimization process. The document also highlights what practices are not recommended in SEO and emphasizes the long-term advantages and cost-effectiveness of a well-optimized website.