Big-box store and supermarket self-scanning checkout systems use what source data-entry method?

Big-box store and supermarket self-scanning checkout systems primarily use barcode scanning as their source data-entry method. Customers scan the barcodes on products using handheld scanners or fixed scanning stations, which automatically retrieve product information from a linked database. This method streamlines the checkout process and reduces wait times, allowing for a more efficient shopping experience. Additionally, some systems may also incorporate touchscreens for manual entry or item lookup when necessary.