Labels containing electronic devices that have read/write memory used to store and access information.
The electronic device is a radio frequency identification (RFID) transponder or tag.
The RFID technology, like bar codes, is used to automatically capture data.
It is different from a bar code in that it can hold much more data, it can be reprogrammed, and its data is accessed by a reader but it does not need optical contact with the reader to be read.