Demand-side platform (DSP)
Also known as: DSP
In short
Software that lets advertisers manage and buy digital advertising inventory across multiple sources through automated processes.
A demand-side platform, or DSP, gives advertisers a buying interface for digital advertising inventory. It connects campaigns to available placements across publishers and supply sources, rather than requiring a separate manual purchase for every opportunity.
How a DSP works
The advertiser sets the campaign objective, audience approach, creative, budget, and buying constraints. The DSP evaluates eligible inventory and participates in the supported buying process. Available formats can include display, video, and audio, depending on the platform and its supply connections.
A DSP works on the buyer’s side. A supply-side platform represents publishers and their available inventory. The two roles can interact through exchanges and other buying arrangements.
Costs can include more than the media placement itself. Platform, data, measurement, or service fees may affect the total amount an advertiser pays.
Illustrative example
A household brand wants to reach an audience across several publishers. Its team uses a DSP to manage the campaign, select suitable inventory, apply a frequency policy, and compare delivery and cost in one reporting workflow.
The example does not imply access to every website or a guaranteed audience match. Check inventory coverage, supply quality, reporting definitions, and the full fee structure before comparing one DSP’s apparent media cost with another’s.