Suppose you wish to watch a movie or share a slide-show of pictures with your family on your PC but have a screen that leaves much to be desired. In such a situation, you can connect your computer to a television screen to allow your entire family to enjoy comfortably.
There are many ways in which you can connect your laptop/ computer to a television. However, the overall video quality will be different for different methods. You can choose which one to use based on the quality or the availability of hardware.
The oldest and the lowest quality connection available. They are the Yellow, Red and White connections most of us are familiar with. Yellow is used for composite video, white for left analog audio and red for right analog audio.