PuTTY is a terminal simulator and a simple application for connecting to a Linux server in Windows. The program supports several protocols including SCP, SSH, Talent and rlogin. The name PuTTY has no specific meaning, TTY is an abbreviation used in Unix for the word Teletype and is the name of the terminal. The program is originally written for the Microsoft Windows operating system, but it also comes with several different operating systems.
Official ports of this program are available for Unix-like operating systems. (soft98)