RFID tags are small devices that utilize radio frequency (RF) technology to communicate information. They are an essential part of any RFID system and are used to store the data that identifies the object to which they are attached.

RFID tags typically consist of two parts:

    An Integrated Circuit (IC): This is essentially the 'brain' of the tag. It stores the identification data and controls the functions of the tag.

    An Antenna: The antenna receives and transmits the radio frequency signals.

There are three main types of RFID tags:

    Active RFID Tags: These tags have their own power source, like a battery. This allows them to broadcast a signal and they can be read from a much greater distance.

    Passive RFID Tags: These tags do not have their own power source. Instead, they receive power from the reader when it sends out a radio wave that induces a current in the tag's antenna. Because they rely on the reader for power, they have a much shorter read range.

    Semi-Passive RFID Tags: These tags are somewhat of a middle ground between active and passive tags. They have a battery, but the battery only powers the IC, not the broadcasting of the radio signal.

RFID tags are used in a wide variety of applications, including tracking inventory, managing livestock, timing races, controlling access, and electronic toll collection. They can be affixed to almost anything – from a vehicle to a pallet of goods to a pet.