What is RFID?

Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. The tags contain electronically stored information.

       A (RFID) system is made up of two parts:
                       * a tag 
                       * a reader. 

RFID tags  are embedded with a transmitter and a receiver. The RFID component on the tags have two parts: a microchip that stores and processes information, and an antenna to receive and transmit a signal. The tag contains the specific serial number for one specific object.

To read the information encoded on a tag, a two-way radio transmitter-receiver called reader emits a signal to the tag using an antenna. The tag responds with the information written in its memory bank.

There are two types of RFID tags: passive and active. A Passive RFID tag will use the reader’s radio wave energy to relay its stored information back to the reader. A Active RFID tag is embedded with a small battery that powers the relay of information. 

RFID can be used in a variety of applications, such as:

> Access management
> Tracking of goods
> Tracking of persons and animals
> Toll collection and contactless payment
> Machine readable travel documents
> Smartdust (for massively distributed sensor networks)
> Airport baggage tracking logistics
> Timing sporting events
> Tracking and billing processes

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