network cards hard wire your computer to the internet through a router or modem etc. Of course there worth the money if you need one, but I think that almost all motherboards have network capability built in. Audio and Network are 2 common things built into motherboards now that are just fine for regular use. Just look at the back panel of your computer and see if there is a port thats slightly larger then a phone port. I have 2 extra D-Link ones that I dont use so send me a pm if you want one.
