The System Monitor is a tool used in computer operating systems to track and display the performance and resource usage of the system. It provides real-time information about CPU usage, memory consumption, disk activity, and network traffic. Users can easily identify which applications are consuming the most resources and monitor overall system health. In many operating systems, such as Windows and Linux, the System Monitor can be accessed through a graphical interface or command line. This tool helps users troubleshoot performance issues, manage running processes, and optimize system performance by providing essential data in an understandable format.