Online advertising, also known as online advertisement, internet marketing, online marketing or e-marketing, is the marketing and promotion of products or services over the Internet. Examples of online advertising include contextual ads on search engine results pages, banner ads, blogs, rich media ads, social network advertising, interstitial ads, online classified advertising, advertising networks, dynamic banner ads, cross-platform ads and e-mail marketing, including e-mail spam. Many of these types of ads are delivered by an ad server.
