If you have ever used an access card to get into a building or your car or passed through an automated toll collection system on a highway, you have used RFID. The definition of RFID is rather broad because it has so many uses. Let's first start with the acronym and what it means:

RFID = Radio Frequency IDentification

Now, let's break down what this means: a system of technologies that allows an object, person or animal to wirelessly identify itself to another object, person or animal. Hence the words RF (Radio Frequency) and ID (IDentification).

Radio Frequency Identification (RFID) technology is an automated data capture technology that identifies labeled or tagged objects wirelessly. The system consists of an RFID tag and an RFID reader( with inbuilt or external antenna) that relays the information on the tag, in digital form, to a computer system.

Unlike bar-code labels, which can only function if the bar-code is oriented towards the scanner and the scanner "sees" the bar-code RFID tags can work within multiple feet of a querying reader (depending on the tag, of course), and multiple tags can be read at once For example, at a grocery store checkout clerks have to orient the barcode toward a scanner for them to be scanned, with an RFID tag he/she simply keeps all tagged items on the antenna for multiple reads, Similarly RFID technology can be used for asset and people tracking as well as inventory management and anti-counterfeiting..