A Supply-Side Platform (SSP) is a technology platform that helps publishers manage and sell their advertising space more effectively. It connects publishers with multiple ad exchanges and demand-side platforms, allowing them to maximize their revenue by optimizing ad placements in real-time. SSPs automate the process of selling ad inventory, making it easier for publishers to reach potential advertisers. By using an SSP, publishers can gain insights into their audience and ad performance, enabling them to make data-driven decisions. This technology plays a crucial role in the digital advertising ecosystem, benefiting both publishers and advertisers by streamlining the buying and selling process of online ads.