i have 2 options available to capture from which are composite and s-video. what exactly is composite though as i thought it was just the cable that feeds from the video player to the tv (or iomega buz card in my case)

the reason i ask is that when i try to capture using the composite option, i don`t get anything on the screen and am unable to test the s-video option due to not having anything to connect it to (not yet anyway)