This document provides an overview of search engine optimization (SEO) including its history from the 1990s to present day. It discusses early SEO techniques like descriptive file names, page titles, and meta descriptions. It then covers how SEO evolved with the introduction of keywords, keyword density, and backlinks. The document also provides examples of on-page and off-page optimization techniques businesses can use to make their sites more SEO friendly. Finally, it shares success stories of how specific companies improved their search rankings through SEO strategies.