An advertising network or ad network is a company that connects web sites that want to host advertisements with advertisers who want to run advertisements. Increasingly Ad networks are companies that pay software developers as well as web sites money for allowing their ads to be shown when people use their software or visit their sites.
Online advertising inventory comes in many different forms. This inventory can be found on websites, in RSS feeds, on blogs, in instant messaging applications, in adware, in e-mails, and on other sources. Some examples of advertising inventory include: banner ads, rich media, text links, and e-mails. (This is not an exhaustive list.)
An advertiser can buy a run of network package, or a run of category package within the network. The advertising network serves advertisements from its ad server, which responds to a site once a page is called. A snippet of code is called from the ad server, that represents the advertising banner.
Large publishers often sell only their remnant inventory through ad networks. Typical numbers range from 10% to 60% of total inventory being remnant and sold through advertising networks.
Smaller publishers often sell all of their inventory through ad networks. One type of ad network, known as a blind network, is such that advertisers place ads, but do not know the exact places where their ads are being placed.
In most cases, ad networks deliver their content through the use of a central ad server.
Large ad networks include a mixture of search engines, media companies, and technology vendors.
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