An ad server is a technology platform that serves and manages online advertisements, allowing advertisers to display their ads on websites, apps, and other digital platforms. It acts as a central hub for ad management, delivering targeted ads to specific audiences based on factors such as demographics, browsing behavior, and location. Ad servers also track and report on ad performance, providing valuable insights to advertisers and publishers. With the ability to optimize ad delivery and measure results, ad servers play a crucial role in the success of online advertising campaigns.