Contextual advertising according to www.webopedia.com is advertising on a Web site that is targeted to the specific individual who is visiting the Web site. A contextual ad system scans the text of a Web site for keywords and returns ads to the Web page based on what the user is viewing, either through ads placed on the page or pop-up ads. For example, if the user is viewing a site about sports, and the site uses contextual advertising, then user might see ads for sports-related companies, such as memorabilia dealers or ticket sellers.