Valid - Datamatrix and QRCode
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Datamatrix and QRCode

They are both bidimensional bar codes used for identification of materials or products. The difference between them is that Datamatrix is more efficient when it comes to application space and QRCode is more used. They may contain information such as origin, batch, expiration date, etc. To be read it is necessary to approach it physically to a device, a mobile phone, for example.