what are QR codes and how does my phone camera associate them with a link or URL
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A QR code, or Quick Response code, is a way of encoding text into a visual format that’s easy for computers to read. These days, it’s possible to point a camera at a piece of text and have a powerful computer like the ones in most smartphones work out what that text is, but it’s prone to error because of differences in fonts and writing styles, and there’s no effective way to detect if there has been an error with what the computer has read. QR codes are a way to solve these issues, and were also developed back when it wasn’t easy to detect text in a photo. The computer works out the orientation of the QR code by searching for the large squares in 3 of the corners, and then looks at the white and black squares in between to work out the encoded message. Letters are represented by groups of squares with a certain pattern of black and white, and there is a specific order to read these groups in based on the size of the QR code. Then, there is a complicated system to detect if there is an error in the design of the QR code or how it was read. If it all goes correctly, then your computer is able to decode the QR code into a short piece of text, and if the text is a link, then it will take you to that link.
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