2-D symbologies (two-dimensional) are a more recent addition to the world of barcodes. By storing data both horizontally and vertically to form a square or rectangle, significantly more information can be encoded than is possible with a 1-D barcode. The 2-D symbology is known for high readability and resistance to poor printing; they contain redundant data so even if one or more cells are damaged, the code is still readable. The following examples demonstrate some of the most popular 2-D codes.
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