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Bar-coding is a method of representing data in a visual, machine-readable format using a series of bars of varying widths and spacings. Barcodes are scanned by a barcode reader, which uses a laser or camera to capture the data encoded within the barcode. The data captured by the barcode reader is then used to automatically update inventory, track products, and process other information. Bar-coding technology is widely used in various industries such as retail, manufacturing, healthcare, and logistics to manage inventory, track products, and automate data entry. Barcode technology is cost-effective, efficient, and helps to reduce human error in data entry, resulting in improved accuracy and productivity.