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A data matrix bar code is used on almost very product which is found in stores. The data matrix bar code is used to identify a product and find the price in a computer system.
The first 2D Bar codes where used on Railroad Cars. Check the related link
The first product to have a bar code included was a packet of Wrigley's Gum.
Disregard the first and last bar, they mark the beginning and end of the bar code. Each digit in a bar code is made up of 2 tall and 3 short bars, starting with the second bar read 5 bars as 7,4,2,1,0. which ever numbers has the tall bars add them to get the first digit of the bar code. 7 and 4 is 0.
For example a library