A Supply-Side Platform (SSP) is a technology platform that helps publishers manage and sell their advertising space more effectively. By connecting to various ad exchanges and demand-side platforms, SSPs enable publishers to maximize their revenue by optimizing ad placements and targeting. This automation simplifies the process of selling ad inventory, allowing publishers to focus on content creation. SSPs work by analyzing data to determine the best ads to display based on factors like audience demographics and behavior. This ensures that publishers can attract the right advertisers while providing relevant ads to their users, ultimately enhancing the overall advertising experience.