A Demand-Side Platform (DSP) is a technology that allows advertisers to purchase digital advertising space in an automated way. By using a DSP, advertisers can manage multiple ad exchanges and data sources from a single interface, making it easier to target specific audiences and optimize ad campaigns in real-time. DSPs work by analyzing data to determine the best ad placements based on factors like user behavior and demographics. This helps advertisers reach their desired audience more effectively, ultimately improving the return on investment (ROI) for their advertising efforts. DSPs are often used in conjunction with Supply-Side Platforms (SSPs) to streamline the buying and selling of ad inventory.