Process Explorer is a powerful system monitoring tool developed by Microsoft. It provides detailed information about running processes on a computer, including their resource usage, handles, and threads. Users can easily identify which applications are consuming the most CPU or memory, helping to troubleshoot performance issues. The interface of Process Explorer displays a hierarchical view of processes, allowing users to see parent-child relationships. It also offers advanced features like searching for specific processes and viewing properties of each process. This tool is particularly useful for system administrators and advanced users who need to manage and optimize system performance.