Possible to run my route through my computer?

Okay, please tell me if this is possible, I want to hook my modem directly to my computer through a wired Ethernet connection. Then I want to use my second Ethernet port on my computer and hook it up to a wireless router.

Is there a way to bridge these connections? So my desktop will still have internet through the modem, and I can have the wireless router that sends a wireless signal?

I'm just curious is this scenario is possible, if it is, i'd like to know how please!