Real User Monitoring (RUM) is a passive technique that captures and analyzes real-time data from actual user interactions with web applications, providing insights into user experience, unlike synthetic monitoring which relies on simulating user actions. By tracking metrics such as page load times, user interactions, and errors, RUM enables organizations to identify performance bottlenecks and optimize website functionality based on real-world data. RUM operates by embedding a small code snippet in web pages, which collects data on user interactions and sends it to a backend server for analysis. This analysis helps organizations understand user behavior, identify geographic and device-based performance variations, and improve user experience through insights not available from synthetic monitoring. Tools like PubNub, Google Analytics, New Relic, and Datadog offer various RUM functionalities, providing real-time data collection, analytics, and visualization to aid in optimizing user experience and business outcomes. RUM is particularly effective for user-centric websites, web applications with high interaction levels, and globally diverse user bases, as it allows for proactive issue identification and performance benchmarking. By integrating RUM with broader observability frameworks, organizations can enhance their digital experience monitoring, application performance monitoring, and infrastructure monitoring to ensure seamless and efficient user experiences.