How do I connect two computers that are in different rooms to the internet?

xOXoXox1

New member
I know there's the wireless route but I'm trying to see if wired works.
The one is upstairs is connected using the modem that came with the AT&T service. Now we have a new computer downstairs and I have no idea how to connect it to the internet. We have a ethernet port/cable thing if that helps.
 
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