Unity Ads is a platform that allows game developers to monetize their mobile games through advertisements. It provides various ad formats, including video ads, rewarded ads, and banners, enabling developers to choose the best way to engage their users while generating revenue. The service is integrated into the Unity game development engine, making it easy for developers to implement ads without extensive coding. By using Unity Ads, developers can reach a large audience and optimize their ad strategies based on performance analytics, ultimately enhancing their game's profitability.