The document provides an overview of search engine marketing (SEM). It discusses the brief history of search engines like Google and Yahoo. It then explains different SEM methods like search engine optimization (SEO), paid placement, and paid inclusion. It also discusses building search engine-friendly websites, factors that affect search engine rankings, and considerations for international SEM campaigns. Social bookmarking is introduced as a new potential source for SEM. Statistics are presented on the importance and effectiveness of SEM.