AppsFlyer is a mobile app tracking and analytics platform that helps developers, marketers, and advertisers understand and optimize the performance of their mobile apps. It provides a range of tools and services, including install tracking, in-app event tracking, audience segmentation, retargeting, attribution, and integrations with third-party platforms. With AppsFlyer, companies can track and analyze app usage, user behavior, and marketing campaign effectiveness, allowing them to make informed decisions about their app strategy and marketing efforts.