Tera Term is a free, open-source terminal emulation program that allows users to connect to remote systems via protocols like SSH, Telnet, and Serial. It provides a user-friendly interface for managing connections and executing commands on remote servers, making it popular among system administrators and developers. In addition to basic terminal functions, Tera Term supports scripting, enabling automation of repetitive tasks. It also features file transfer capabilities, allowing users to upload and download files between local and remote systems. Overall, Tera Term is a versatile tool for anyone needing reliable remote access.