SSH is know as secure shell. It is a network protocol that provides authentication and encryption to remote Internet connections.
Why Should I Care
If you routinely log into one computer to gain access to another, then you will want to secure that connection. The Internet is one big endless world to explore and enjoy. The downside is, there are ways your enjoyment can come to an abrupt halt from malicious intentions such as IP and DNS spoofing. SSH encryption ensures that your Internet connections are as safe as possible. Engadget has a very good How-To on SSH. See link below.
SSH on Engadget