Hub or switch?

Ok, here's my situation. I currently have four computers in my apartment wired to a four port Linksys router. The problem is, I have another computer in my room I would like to add to the network to access the internet and share files with. So my question is this: would I need a hub or switch to accomplish this? I don't need anything fancy, just something that would enable me to add this computer to the network.

I'm sure someone is going to suggest going wireless but I'd rather not since I had a bad experience with Netgear wireless hardware, thus wiring my whole apartment with cat5. Plus, I'm trying to keep it on the inexpensive side.

Thanks!

Jam it back in, in the dark.

Are there any main differences between the two?

Another thing I'm wondering about is how to actually use the hub/switch. I hear from a co-worker that in order to use a hub, I would need a second network card to connect to the hub. Is that true?

How ya doing, buddy?

Thanks for the information, Snowknight. I really hope I don't need to use a cross over cable since I've got a good length of cat5 already stapled down a hall and into my room.

This thing is sticky, and I don't like it. I don't appreciate it.

Excellent, then a switch it is! Thanks for all your hellp guys, my 'media pc' is coming together nicely now.

I am a dolphin, do you want me on your body?