Difference between TV cards

[gilgamish]

What is the substantial difference between TV Tuner, TV Card, and TV in-out?

 

[rbV5]

*TV Tuner: a component used to tune TV channels.
*TV Card: A PC addon card with a tuner used to watch TV on your PC.
*TV in-out: Usually refered to as VIVO (Video in...Video out) A video card, capture card or motherboard with this feature allows you to capture analog video streams from a variety of analog sources such as a VCR, STB or video camera. Has the ability to output your desktop or analog video to a display device or a recorder such as a TV or VCR.