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Radio Frequency Identification (RFID) can be thought of as the new generation of barcode technology. It is meant to provide us with a convenient way to track items, record the presence of items, etc. One major improvement from barcodes is that RFID tags can be programmed with small arrays of data.

The RFID technology consists of small RFID tags (also called transponders) and RFID readers. The RFID tags are similar barcodes; each has a serial number, and is tiny enough to be put on a sticker, wristband, or button; they can be selected, written, or read. The RFID reader is the part that transmits the radio waves to the tags. It sends byte arrays to the transponders and thus communicates with them.

Maria Kazandjieva, makazand[at]mtholyoke[dot]edu, Summer 2005