ad network

Ad networks (advertising network, banner network, online ad network) are advertising companies which administer ad sales, billing, serving and collection for web sites. Ad networks often aggregate sites into specific categories or demographic groups, then sell ad inventory to advertisers either to specific sites within the networks, specific categories or demographics, or via run of network buys which target sites within the network. Ad networks can sell ad inventory on CPM, CPC, CPA and other revenue models. A reviewed list of ad networks can be found here at Internet Ad Sales. Click the Online Ad Networks link above.