The document provides an overview of the Real-Time Bidding (RTB) ecosystem, highlighting key components such as demand side platforms (DSPs), supply side platforms (SSPs), private marketplaces, trading desks, data management platforms (DMPs), and data providers. It explains the roles and functionalities of these components in programmatic buying and emphasizes the importance of data for effective RTB. Additionally, it discusses the current state and challenges of the RTB market, noting that only a small portion of global inventory is currently traded via RTB.