What is Two Gigabit Ethernet ports good for?

[jzjz]

I was looking over different motherboards and some have one ethernet port and some have two. I tried to think of a use for two, but nothing came to mind. I then thought maybe the computer could access 2 separate networks? Ok, that probably doesn't make much sense. Can someone tell me what cool things I could do with 2 ports please?

 

[thehelo]

ics, bridging, being connected to 2 different networks at one time.

 

[jzjz]

Thanks thehelo.

 

[suvayanr]

or using your computer to control the network