Radio-frequency Identification (RFID) uses electronic tags that can identify and track individual items such as book, jugs of laundry detergent, automobiles, or even people. One of the best-known uses of RFID is OnStar, which is a satellite-based RFID system used in automobiles. RFID tags emit radio signals that can be read remotely by electronic readers and provide precise, real-time information about the location of specific items, whether it be a Cadillac with a deal battery, a misplaced book in a bookstore, or a pallet of merchandise in a warehouse.