PuTTY Is A Free Implementation Of Telnet And SSH For Win32 And Unix Platforms, Along With An Xterm Terminal Emulator.
PuTTY Is A Client Program For The SSH, Telnet And Rlogin Network Protocols.
These Protocols Are All Used To Run A Remote Session On A Computer, Over A Network. PuTTY Implements The Client End Of That Session: The End At Which The Session Is Displayed, Rather Than The End At Which It Runs.