Self-checkout machines are automated kiosks found in many grocery stores and retail outlets. They allow customers to scan and pay for their items without the assistance of a cashier. Users typically scan barcodes on products, place them in a bagging area, and complete their transactions using a touchscreen interface. These machines often accept various payment methods, including cash, credit cards, and mobile payments. Self-checkout systems aim to reduce wait times and improve efficiency in stores. They are popular among shoppers who prefer a quicker, more private shopping experience, while also helping retailers manage labor costs.