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. Online advertising is a form of promotion that uses the Internet and World Wide Web to deliver marketing messages to larger audience. 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. Online advertising is a form of promotion that uses the Internet and World Wide Web to deliver marketing messages to attract targeted customers. The internet has become an ongoing emerging source that tends to expand more and more. The growth of this particular medium attracts the attention of advertisers as a more productive source to bring in consumers. A clear advantage consumers have with online advertisement is the control they have over the product, choosing whether to check it out or not.Online advertisements may also offer various forms of animation. In its most common use, the term "online advertising" comprises all sorts of banner, e-mail, in-game, and keyword advertising, including on platforms such as Facebook, Twitter, and MySpace. Web-related advertising has a variety of ways to publicize and reach a niche audience to focus its attention to a specific group.