Marketing through the Internet opened new frontiers for advertisers and contributed to the "dot-com" boom of the 1990s. Entire corporations operated solely on advertising revenue, offering everything from coupons to free Internet access. This has led to a plethora of similar efforts and an increasing trend of interactive advertising.

Methods to advertising in the internet have grown since then, and among of the most successful form of internet advertising is the contextual advertising.

Contextual advertising is a form of targeted advertising on advertisements appearing on websites or other media, such as content displayed in mobile phones, where the advertisements are selected and served by automated systems based on the content displayed to the user. Visit the Internet Advertising Philippines for more information about internet advertising.

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, the user might see ads for sports-related companies, such as memorabilia dealers or ticket sellers.

Contextual advertising also is used by search engines to display ads on their search results pages based on what word(s) the users has searched for. Visit the Visit the Internet Advertising Philippines for more information about internet advertising.

Google AdSense was the first major contextual advertising program. It worked by providing webmasters with JavaScript code that, when inserted into web pages, called up relevant advertisements from the Google inventory of advertisers. The relevance was calculated by a separate Google bot that indexed the content of the page.

Contextual advertising has made a major impact on earnings of many websites. As the ads are more targeted they are more likely to get clicked, thus generating revenue for the owner of the website. A large part of Google's earnings are from their share of the contextual ads served on the millions of webpages running the Adsense program. For more information about internet advertising and marketing strategies and methods, then visit the Internet Advertising Philippines for more information.