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Radio-frequency identification (RFID) is a technology that uses communication via radio waves to exchange data between a reader and an electronic tag attached to an object, for the purpose of identification and tracking.
the low energy Bluetooth-based beacon concept, which allows Bluetooth devices to broadcast or receive tiny and static pieces of data within short distances. In simplistic words, it consists of two parts: a broadcaster (beacon device) and a receiver (smartphone app). The broadcaster is always advertising “I am here, and my ID is…”, while the receiver detects these Bluetooth radio packets and does whatever it needs to do based on how close or far it is from them.