The document provides an overview of the various players in the ad tech space through a collection of links on different topics. It covers the basics of programmatic buying and selling as well as real-time bidding (RTB). It also discusses programmatic advertising beyond RTB including private marketplaces. Other sections explore the role of audiences, fraud and brand safety, viewability, native advertising, and the use of analytics and big data. The links provide information on topics like supply side platforms (SSPs), demand side platforms (DSPs), data management platforms (DMPs), and how various technologies work together in the programmatic advertising ecosystem.