Radio Frequency Identification (RFID) these is a set of technologies that allow for short range, contact-less reading of information from a low cost, compact, data source. By definition it Is the wireless use of electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information. Some tags are powered by electromagnetic inductions from magnetic fields produced near the reader.
It can also be used to identify individuals in order to allow or prevent access or to provide information about their whereabouts.
RFIDs can be used as part of systems for logistics and delivery tracking, security or for managing safety inspections. Many types of RFID exist, but at the highest level RFID devices, can be divided into two classes: active and passive.
Active tags require a power source—they’re either connected to a powered infrastructure or use energy stored in an integrated battery. One example of an active tag is the transponder attached to an aircraft that identifies its national origin. Passive RFID is the main interest because the tags don’t require batteries or maintenance. The tags also have an indefinite operational life and are small enough to fit into a practical adhesive label.
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