A DSP is the software advertisers use to buy programmatic inventory across exchanges and publishers from one interface — bidding, targeting, frequency, and reporting for the buy side.
Definition
DSPs connect to exchanges and SSPs, evaluate impressions against the advertiser's campaigns, and bid on the buyer's behalf. They matter most for open-web display, video, and CTV — channels outside the walled gardens, where a buying platform is genuinely needed to access fragmented supply. Major platforms' ad managers are effectively closed DSPs for their own inventory.
Why it matters
The DSP layer is where the agentic disruption question lands hardest: if an AI agent can discover inventory and negotiate directly with publisher agents, what exactly is the interface-and-percentage layer for? DSPs are responding by building agents into their own products — betting that decisioning quality and supply relationships, not the UI, are what they actually sell.
In agentic execution
For performance departments, most spend runs through platform-native auctions rather than open-web DSPs — which is where Adlyse's agents execute today, with the same supervised model extending as buying rails evolve.
Related terms
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