The Task Manager is a system utility in operating systems like Windows and macOS that allows users to monitor and manage running applications and processes. It provides information about CPU, memory, disk, and network usage, helping users identify resource-intensive tasks. Users can access the Task Manager to end unresponsive programs, start new tasks, or view system performance metrics. It is a valuable tool for troubleshooting issues and optimizing system performance, ensuring that the computer runs smoothly and efficiently.