Squeeze box

i heard about this device which allowed you to link your amplifier or something like that to your computer? making your computer act as a cd player. i don't know much about this device i just heard a little something about it, and for all i know it doesn't exist.

if it does exist, could someone give me more information?

it would also allow me to get rid of that cheap 5.1 setup i have on my pc.

edit : the strange device is a squeeze box