What's a barcode?

2015-10-20
Barcode is a graphic identifier that ranges the black bars and blanks with different widths according to the certain coding rules to present a set of data. Originally a barcode represents data by varying the widths and spacing of parallel lines, and may be referred to as linear or one-dimensional (1D). Later they evolved into rectangles, dots, hexagons and other geometric patterns in two dimensions (2D). 
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