Supply-Side Platform
A technology platform used by publishers and app developers to manage, sell, and optimize their advertising inventory across multiple demand sources, maximizing revenue per impression through automated auction mechanics.
A supply-side platform (SSP) is the publisher's counterpart to the DSP. It connects a publisher's ad inventory to multiple ad exchanges, demand-side platforms, and ad networks, creating competition among buyers for each impression. The SSP's algorithms determine floor prices, manage auction dynamics, and select the highest-value bid for every ad slot.
Understanding SSPs matters for growth teams because the supply side directly affects the cost and quality of inventory you can access. SSPs implement features like header bidding that increase auction transparency and can improve the inventory quality available to advertisers. For teams building content-driven growth strategies or running their own properties, SSP selection and configuration directly impacts monetization revenue. AI plays an increasing role in SSP optimization through dynamic floor pricing, traffic quality scoring, and yield prediction models that help publishers extract maximum value from their audience.
Related Terms
Programmatic Advertising
The automated buying and selling of digital ad inventory using software platforms and algorithms, replacing manual negotiation with real-time, data-driven decision-making across display, video, and native channels.
Demand-Side Platform
A software platform that enables advertisers and agencies to purchase digital ad inventory across multiple ad exchanges through a single interface, using data and algorithms to optimize bidding and targeting decisions.
Ad Exchange
A digital marketplace that facilitates the buying and selling of advertising inventory between advertisers and publishers in real time, operating as a neutral auction platform connecting DSPs and SSPs.
Real-Time Bidding
An auction-based mechanism where individual ad impressions are bought and sold in real time as a user loads a page, with the entire bidding process completing in under 100 milliseconds per impression.
Header Bidding
A programmatic technique where publishers simultaneously offer ad inventory to multiple demand sources before calling their primary ad server, increasing competition and revenue by allowing all bidders to compete on equal footing.
Cost Per Mille
The cost an advertiser pays for one thousand ad impressions served, commonly abbreviated as CPM. It is the standard pricing unit for display and video advertising across programmatic and direct buying channels.