A system monitor is a tool that helps track the performance and health of a computer or network. It provides real-time data on various metrics, such as CPU usage, memory consumption, and disk activity. By monitoring these parameters, users can identify potential issues and optimize system performance. These tools can be standalone applications or integrated into operating systems like Windows or Linux. System monitors often feature visual displays, such as graphs and charts, making it easier for users to understand complex data at a glance. They are essential for maintaining efficient and reliable computing environments.