This tutorial answers your question i.e. how to set up Passwordless SSH? SSH �is a protocol to communicate a server with the client in an encrypted manner.
It has replaced telnet protocol, which was not at all secure at all. Almost all the Linux system admins know about it because they use it to connect to Linux servers as the physical access to the server is very limited.
SSH is installed by default on most Linux distribution. In this tutorial, we will learn to access ssh sessions securely with the help of Public/Private keys authentication aka passwordless ssh setup.