Contextual advertising is a form of targeted advertising for advertisements appearing on websites or other media, such as content displayed in mobile browsers. In context targeting, advertising media are controlled on the basis of the content of a website using linguistic elements. The advertisements themselves are selected and served by automated systems based on the context of what a user is looking at. How it works A contextual advertising system scans the text of a website for keywords and returns advertisements to the webpage based on those keywords. The advertisements may be displayed on the webpage as pop-up ads. For example, if the user is viewing a website pertaining to sports and that website uses contextual advertising, the user may see advertisements for sports-related companies, such as memorabilia dealers or ticket sellers. Contextual advertising is also used by search engines to display advertisements on their search results pages based on the keywords in the user's query. Contextual advertising is a form of targeted advertising in which the content of an ad is in direct correlation to the content of the web page the user is viewing. An example of contextual advertising is an ad offering a special price on a flight to Italy appearing on a website concerning traveling in Europe. Contextual advertising is also called "In-Text" advertising or "In-Context" technology. Apart from that when a visitor doesn't click on the ad in a go through time (a minimum time a user must click on the ad) the ad is automatically changed to next relevant ad showing the option below of going back to the previous ad. Contextual ads are less irritating than traditional advertising. That is why it influences user more effectively. It shows user area of interest thus increasing the chance of receiving a response. Service providers Google AdSense was the first major contextual advertising network. It works by providing webmasters with JavaScript code that, when inserted into webpages, displays relevant advertisements from the Google inventory of advertisers. The relevance is calculated by a separate Googlebot, that indexes the content of a webpage. Recent technology/service providers have emerged with more sophisticated systems that use language-independent proximity pattern matching algorithm to increase matching accuracy. Media.net is the other major contextual ad network competing with Google AdSense. Impact Contextual advertising has made a major impact on earnings of many websites. Because the advertisements are more targeted, they are more likely