As the use of barcodes have caught on in the last 30 years, there has been a serious drive to apply them to more and more items. One limitation of the original barcode system - called 1d or linear barcodes has been the space requirement. Linear bar codes consist of bars which are scanned in a linear way (from one side to the other). But matrix codes use a 2d arrangement of square cells in a grid. These take up much less room and can hold much more information.
See different types of barcode scanners.
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