Elastic Real User Monitoring (RUM) offers a comprehensive solution for capturing and analyzing user interactions with web applications, providing insights into real user experiences from a performance standpoint. The Elastic RUM Agent, a JavaScript-based tool, integrates with any JavaScript application to identify performance bottlenecks, optimize user experience, and monitor service level agreements (SLAs) through detailed metrics such as latency and throughput. Users can set up Elastic RUM by installing the Elastic Stack and using the APM server, with options for local installation or via Elastic Cloud. The blog demonstrates the setup process using a simple car database application with a React frontend and Spring Boot backend, showcasing both default and custom instrumentation capabilities. By incorporating Elastic's APM, developers can utilize distributed tracing to visualize interactions from the frontend through to backend databases, which is particularly useful for understanding the impact of new features and optimizing application performance across different browsers and regions. Additional configurations, such as cross-origin resource sharing (CORS), are necessary to support distributed tracing across different server origins, enhancing the capability to track and resolve performance issues comprehensively.