Use it to connect the video card on your computer to a TV input. Your video card MUST be able to support s-Video or Composite out through it's VGA port. This is known as a TV out function. If you don't know if your video card can do this, then call the card manufacturer and ask them "Does my video card support S-Video or Composite Video out through its VGA port?" If it does, then buy this adapter. If not, then use Product # 4724