Google AdMob is a mobile advertising platform that allows app developers to monetize their applications by displaying ads. It provides a variety of ad formats, including banners, interstitials, and rewarded video ads, enabling developers to choose the best fit for their app's user experience. With AdMob, developers can easily integrate ads into their apps and earn revenue based on user interactions. The platform also offers analytics tools to help developers track ad performance and optimize their strategies, ensuring they maximize their earnings while maintaining a positive user experience.