The full form of DFP is DoubleClick for Publishers.

Google DoubleClick for Publishers (DFP) Small Business is a free ad management solution that helps growing publishers sell, schedule, deliver, and measure all of their digital ad inventory. You’ll be quickly on your way to maximizing the value of your ad impressions.

DFP which stands for DoubleClick for Publishers is an SAS platform designed to manage the process of delivering ads to your websites, mobile devices, games and much more.

The SAS platform is also called ad serving. Which put simply, is the technology and services that puts ads on all your websites. This service is an application run by Google and it provides you with a toolkit to manage your ads for a multi-device audience.

DFP features include a central place, advanced forecasting, and revenue optimization. The central place is one page to analyze your traffic on all of your platforms. Advanced forecasting calculates how many impressions you will receive on each ad that you sell to advertisers. Revenue optimization uses Google AdSense and Ad Exchange which scans all networks to find where you get the most revenue for each ad impression.