At the start, the affiliate programs were between the advertiser and the publisher with a simple arrangement. But as things progressed they became unmanageable for both parties. Things like tracking, management of large numbers of affiliates in diverse locations and management and reliability of advertisers became impossible. Enter the Affiliate Ad Network to put all this together. The Ad Network’s administer and manage the the payments, communication, advertisers, publishers, offers, reports, and commissions. Some will validate the advertiser and publisher and provide technical support. The Ad Networks usually charge a 30% commission to the Advertiser and spend a lot of time trying to recruit new advertisers and publishers.