its like a recording thing that records everything you do on your comp and you can replay it and watch it...example when you play a game on the comp you can record it from it and re-play it and post it on youtube, facebook etc...
not sure what your talking about.if you want to record yourself (face,body.etc) then it's a webcam.if you want to record stuff you do on your computer (recording games or making a tutorial)then it's usually a video recording software (like FRAPS and Bandicam)