Delivering ads to Internet users via Web sites, e-mail, ad-supported software and Internet-enabled cellphones. Also called an "ad network," Internet advertising organizations act as a middleman between the advertiser and the Web sites and software publishers that display the ads. They make a profit by selling the online campaign to the advertisers and paying the sites to distribute them. Such organizations may also provide software tools and/or adservers that enable an organization to deliver the ads it generates itself. See banner exchange, banner ad and adserver.