The document discusses search engine spam and how to report it. It defines spam as pages created to trick search engines into providing inappropriate results. The document outlines the main categories of spam: content spam, domain spam, link spam, redirect spam, and cloaking. Content spam involves keyword stuffing and hidden text. Domain spam registers multiple domains to boost rankings. Link spam uses deceptive linking to artificially boost popularity. Redirect spam deflects visitors from ranked pages. Cloaking delivers optimized content to search engines and different content to users. The document provides links to report spam to Google, Yahoo, and MSN.