DSP

In programmatic advertising, a Demand-Side Platform (DSP) is a service that allows agencies and separate advertisers to perform media buying activities and bid on inventory from publishers. With DSPs, marketers can bid on video, in-app, display, audio, digital out of home, and other types of ads.
 
DSPs are a backbone of modern Ad Tech, as they allow advertisers to manage campaigns across multiple real-time bidding platforms.