PuTTY is an SSH and telnet client, developed originally by Simon Tatham for the Windows platform. PuTTY is open source software that is available with source code and is developed and supported by a group of volunteers.
PuTTY is a communications tool for running interactive command-line sessions on other computers, usually via the SSH protocol. It can also communicate over a serial port, or speak various legacy Internet protocols such as Telnet.
PuTTY is a free implementation of SSH and Telnet for Windows and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham.