Tera Term (alternatively TeraTerm) is an open-source, free, software implemented, terminal emulator (communications) program.

Original development of Tera Term stopped in the late 1990s at version 2.3, but other organizations have created variations.

In October 2002, Ayera Technologies released TeraTerm Pro 3.1.3 supporting SSH2 and added multiple other features like a built-in web server for API integration with external systems, recurring "keep-alive" commands, and ODBC database support via the TT Macro Scripting Language.

In 2004, Yutaka Hirata, a software designer from Japan, restarted development of the open source version of Tera Term.

In January 2005, Boris Maisuradze, together with Yutaka Hirata, started the TeraTerm Support forum where they answered questions from Tera Term users.