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QR codes are everywhere and hears how they work they can be of any color but the foreground color should have enough color contrast to differentiate it from the background so those three squares in the corners are the position markers to recognize where the QR code is and its orientation so this is why you can scan them from any direction and it still works there is also another small square somewhere in the bottom right corner called the alignment pattern which aligns the code even if it is curved as skew and there is an L-shaped set of modules called the timing pattern which helps to identify the size of the data Matrix and this data Matrix is where the actual data is stored along with error correction codes here and there so that you can still scan the code even when it is damaged up to like 30 percent and these little patterns contain the format and version information to make it easier to scan the code so totally there are 40 versions of QR code which can hold from 25 characters o
