Sell side platform
A sell side platform (SSP), also called sell side optimizer, inventory aggregator, and yield optimizer is a technology platform that provides outsourced media selling and ad network management services for publishers. A sell side platform business model resembles that of an ad network in that it aggregates ad impression inventory. However, a sell side platform serves publishers exclusively, and does not provide services for advertisers.
The inventory managed by the SSP is usually purchased by aggregate buyers, either demand side platforms (DSPs) or ad networks.