USB wireless adapter?

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Ok, I've just got wifi router, as in my family there are more people who need internet at the same time, but it came out that our table PC have not ability for wireless connection (it's quite new one so it's a bit surprising and I didn't expect it) according to fact that we need to set up router via this computer, it's necessary to make it wireless connection avaliable. I know about USB wireless adapter, which seems like it should help. My question is, will it really work in this case? Like, will I be able to connect to wifi via the PC after getting the USB adapter? How does it work? Will I just purchase that adapter, connect it to PC via USB cable and it will work? Please, if you can help me in this, I will be so thanful, because I am desperate about this situation