PuTTY

“Simon Tatham” was the person to discover Putty.

1. Basically,a putty is a free “open source”,network file transfer application and it supports several network protocol.And it was originally
written for “Microsoft windows” but it supports many variations on the secure remote terminal to various other operating systems.
It has also control over “SSH encryption key”and”Protocol version”.

2.It offers a quick and easy way to securely access “Unix server” from a window system”SSH via PUTTY”.