Intermediary companies that work between web publishers, sometimes called affiliates, and merchants to assist in the advertising of their services or goods. Commonly deals are structured on a cost-per-lead, cost-per-sale-basis, cost-per-click or a hybrid basis. The transactions are commonly tracked and reported through the use of cookies, small text files, placed on the PC's hard drive.
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Various forms of advertising models, from PPC, CPA etc. This area also contains sites that help block ads and other such items from the network.
