DoubleClick for Publishers (DFP) is an ad serving platform aiding publishers in organizing and selling advertising inventory efficiently, offering both a paid premium version for high-traffic sites and a free version for smaller publishers. Key features include managing multiple ad tags, passbacks for unsold impressions, and a powerful reporting system for ad optimization. The document outlines how to set up, create orders, line items, and manage ad partners to maximize revenue from various advertiser types.
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