What's With All the Squares? QR Codes A QR code is comprised of an array of squares, some of which are used for the image sensor to position itself (that's the large squares on three of the corners), while the rest of the cells contain version and format information as well as the data itself, of course, along with error correction coding. Whereas most of the barcodes you come across are one-dimensional, such as UPC labels on items at the store, QR codes are two-dimensional and offer many advantages. For instance, QR codes can be scanned in any direction instead of only one, they can contain thousands of alphanumeric characters versus only a dozen or so, and when configured with a high level of error correction they are particularly capable at continuing to function after sustaining damage. The more error correction a QR code has, the less data it can store and incidentally, the more data that is stored within a QR code, the more squares it will have. More sq...
In yet another development, Facebook-owned messaging app, WhatsApp has rolled out yet another feature that would allow the users to individually reply to members in a group without others knowing about it
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