I'm sure you've heard all the cool kids talking about SSH in the cafeteria during lunch, but you had no idea what it was. Be ignorant no more, because Devanshu Mehta is writing a series of posts about using SSH for Apple Matters.
The first in the series explains the basics of SSH and what you'll need to setup before you can start securely tunneling like a spy.
Here's the really short explanation of SSH: it allows you to create secure connections between two computers. The protocol is a standard, so you can SSH into almost any kind of computer, assuming it is running SSH and you have the proper credentials.
I'll be keeping my eye out for the upcoming parts in this series, because who can't use some more secure connections in their life?