What is the Full Form of CD?

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CD Full Form is Compact Disc. It is a kind of optical disk used for storing digital data such as text, video, audio and software etc. Although James Russell is the attributed inventor of the CD. He discovered it in 1965 and the patent of CD. It was sold to the Sony and Philips Company which made it publicly on May 17, 1978 in Japan and by 1983 it further went on to US and Europe. This layer comprises the majority of the CD's thickness and weight. It serves two purposes. First, it protects the data layer from damage on the play side and Secondly it acts as a lens to focus the CD player's laser onto the data layer so it can more easily read the data (much the way lenses in spectacles help eyes focus on the words on a page). 
It  is where the music and any other information are stored. It's the layer that the CD player "reads" in order to create the music, graphics, etc. The data layer is molded or pressed into the top of the clear plastic layer. The data in the data layer is arranged in tracks that spiral like the grooves on a vinyl record. This spiral, also known as track, is made up of indentations known as pits, bifurcated by sections known as lands.

  There are three layers of materials:-
  •  A base layer made of a polycarbonate plastic.
  •  A thin layer of aluminum coating over the polycarbonate plastic. 
  • A clear protective acrylic coating over the aluminum layer. 

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