TCPView is a free utility from Microsoft that provides a graphical representation of all active network connections on a computer. It displays detailed information about each connection, including the local and remote IP addresses, the status of the connection, and the process using it. This helps users monitor network activity and troubleshoot issues. The tool is part of the Sysinternals Suite, which offers various utilities for system management and troubleshooting. TCPView allows users to terminate connections and processes directly from its interface, making it a valuable resource for managing network resources effectively.