Leo has walked to the nearest supermarket to purchase grocery.

Radio-frequency identification (RFID) is the type of short-range wireless communication technology that the billing executive has used in the above scenario. RFID uses radio-frequency electromagnetic waves to transfer data for automatic identification and for tracking tags attached to objects . RFID tags are machine-readable tags that store information about the products, such as name, price, expiry date, etc. RFID readers are readable machines that scan the RFID tags and display the product details on the computer . RFID technology is widely used in supermarkets, warehouses, libraries, and other places where inventory management and tracking are required .