A demand-side platform (DSP) is a system that allows buyers of digital advertising inventory to manage multiple ad exchange and data exchange accounts through one interface.

• This is all kept within one interface which creates a unique opportunity for advertisers to truly control and maximize the impact of their ads.
• DSP provides centralized media planning & buying, access to many publishers, exchanges, networks, SSPs, and etc.
• On DSP, RTB(Real-Time Bidding) is enabled.

You may want to know more about real-time bidding system composed of DSP, SSP, DMP, ATD and ITD.  Please refer following associated information for more information: