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QR code (Quick Response code) is a two-dimensional (matrix) barcode. QR codes often contain data for a locator, identifier, or tracker that points to a website. A QR code stores data efficiently by supporting different encoding modes such as numeric, alphanumeric, byte/binary.

A QR code consists of black squares arranged in a square grid on a white background, which can be read by an imaging device such as a camera. The required data can be extracted from patterns that are present in both horizontal and vertical components of the image.