Technology explained: Radio frequency identification (RFID)

Radio frequency identification (RFID) A way of wirelessly collecting and storing data using a small object, usually a tag or sticker. The object or tag carries an antenna to enable it to receive and respond to radio frequency queries from an RFID receiver.

Voice over IP A way of transmitting voice conversations over the internet. Broadband internet access is required, but call charges are usually cheaper than for ordinary phone networked calls.