PuTTY is a popular SSH and telnet client that helps you establish secure connections over the Internet and doesn’t even require installation. PuTTY is developed originally by Simon Tatham for the Windows platform. PuTTY is an open source software that is available with source code and is developed and supported by a group of volunteers.
It’s especially aimed for programmers and network administrators, which means that newcomers won’t find it easy to use. The program features a simple, straightforward interface with no included documentation.
Despite its apparent simplicity, PuTTY is highly configurable and includes many options to tweak connections, sessions, SSH security features and even the window’s appearance.