Standard TV-Out feature on graphics cards feature a S-Video connection. This means that if you don't have a TV, DVD-Player, VCR, etc. with an S-Video In connector, The TV-Out feature of your graphics card is waisted.
With this adapter, you can convert the S-Video connector from your graphics card into a standard composite (otherwise know as RCA) connection. Now, be able to work on your computer using your TV or watch DVDs playing in your PC on your TV.