A barcode is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or one-dimensional (1D). Later, two-dimensional (2D) barcodes were developed, using rectangles, dots, hexagons and other geometric patterns in two dimensions. Barcodes are commonly used to identify and track products in retail stores, warehouses, and other supply chain applications. A barcode is scanned using an optical scanner (or barcode reader) and the information is then decoded and transmitted to a computer system.
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