A barcode is a machine-readable code represented by a series of parallel lines (bars) or patterns of varying widths and spaces, used to store information such as product numbers, prices, or other identifiers. Barcodes are commonly used in retail, logistics, and inventory management to track items quickly and accurately by scanning with a barcode reader. The data encoded can be read instantly, streamlining processes like checkout, inventory checks, and asset tracking. There are various types of barcodes, including 1D (linear) and 2D formats like QR codes, each serving different data storage and readability needs.