Well, it’s made of funny little squares. Seriously, the most important thing for us (the users) is the fact that it’s two dimensional. 2D barcodes contain more information than conventional one dimensional linear barcodes. Conventional barcodes get wider as more data is encoded. 2D barcodes make use of the vertical dimension to pack in more data.
Many experts involved in mobile marketing think that QR Codes, being one of the more versatile systems, are going to be the next mobile linking systems of the future while the rest are supported and funded by large corporations with commercialism in mind.