I have added this question to get us started:
What is Port Forwarding and what is it used for?
There are a lot of questions on 'port forwarding' but there doesn't seem to be one that cleary states what it is and what it's used for. So:
What is Port Forwarding?
What is it used for, and why would I need it?
I think that we still need an overview of how to set one up as well. (also if it hasn't been done, will a mod please make it CW)
