A UPC code, or Universal Product Code, is a unique series of numbers and bars used to identify products in stores. It typically consists of 12 digits and is found on product packaging. Retailers scan the UPC code to quickly retrieve product information, such as price and inventory levels, making the checkout process more efficient. The UPC code was first introduced in the 1970s and has since become a standard in the retail industry. It helps manufacturers, retailers, and consumers by ensuring accurate tracking and management of products throughout the supply chain.