Tuesday, November 23, 2010

online advertising

Online advertising is a form of promotion that uses the Internet and World Wide Web for the expressed purpose of delivering marketing messages to attract customers. Examples of online advertising include contextual ads on search engine results pages,banner ads,Rich Media Ads, Social network advertising,interstitial ads, online classified advertising, advertising networks and e-mail marketing, including e-mail spam.

The three most common ways in which online advertising is purchased are CPM,CPC and CPA.

Privacy
The use of online advertising has implications on the privacy and anonymity of users. If an advertising company has placed banners in two Web sites. Hosting the banner images on its servers and using third-party cookies, the advertising company is able to track the browsing of users across these two sites.
Third-party cookies can be blocked by most browsers to increase privacy and reduce tracking by advertising and tracking companies without negatively affecting the user's Web experience. Many advertising operators have an opt-out option to behavioural advertising, with a generic cookie in the browser stopping behavioural advertising.





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