Barcodes are a series of parallel lines and spaces that represent data in a machine-readable format. They are commonly used in retail and inventory management to quickly identify products. Each barcode corresponds to a unique identifier, allowing for efficient tracking and sales processing. Scanners read these codes, converting them into information that can be displayed on a computer or cash register. There are different types of barcodes, including UPC (Universal Product Code) and QR codes (Quick Response codes). While UPC barcodes are typically found on consumer goods, QR codes can store more information and can be scanned using smartphones. This versatility makes barcodes essential in various industries.