Datadog Real User Monitoring (RUM) is a tool that provides detailed insight into user behavior and application performance, regardless of whether applications run on mobile devices or in the browser. It supports React Native monitoring, allowing developers to track errors, crashes, launch time, user actions, and network requests, as well as get comprehensive visibility into user behavior, determine which errors need investigation first, and find causes of long load times and dropped frames. With Mobile RUM, users can investigate errors faster, identify performance bottlenecks, and discover the sources of slow refresh rates for both native and JavaScript processes. The tool also provides unified visibility into React-based applications, whether they run in the browser or on iOS and Android devices.