A two-dimensional barcode is a matrix composed of black modules arranged inside a white square pattern. There are different types of 2D barcodes and they can be decoded either using a smartphone or using specific readers.

Before going into the more detail on modern 2D codes, it is worth mentioning that their predecessors were the alphanumeric serial codes, used for decades due to being very simple and easily read.

The first barcodes were introduced in the 40s and are still used on many retail products. The fact that they can be read automatically reduces checkout times and the risk of errors. Barcodes have been a real revolution for small and large producers throughout the last century.
Despite this, the problem related to the amount of information to be encoded has arisen since the 80s due to the fact that barcodes are only able to contain a limited amount of data. To overcome this problem, two-dimensional codes were introduced to the market and this often removes the need for separate external databases.

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