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A piece of software used to sell advertising in an automated fashion. SSPs are most often used by online publishers to help them sell display, video, and mobile ads and to maximize the prices their impressions sell at. SSPs allow publishers to connect their inventory to multiple ad exchanges, DSPs, and ad networks at once. As well as opening up inventory to large range potential buyers, SSPs also offer the ability for publishers to set “price floors,” which dictate the minimum prices for which their inventory can sell to specific buyers or through specific channels.