This video by All About Electronics explains RFID, also known as Radio Frequency Identification. The video walks through what RFID is, the applications of RFID, what is inside a RFID device, and how RFID works (operating principles). RFID works on radio frequencies and is used for automatic identification and tracking of different objects. There are a wide array of objects including books, cars, or commercial/manufactured products to name a few. As RFID technology does not have to be in line of the object (as long as the object is within range of the reader), the reader is able to receive a feedback signal. RFID technology is also able to track multiple objects at a time. The two main components of the RFID system are the RFID reader and the RFID tag. Within the RFID reader, there is a microcontroller, RF signal generator, and a signal detector. The RFID tag includes active tags, passive tags, and semi passive tags. RFID tags mostly operate under three frequency ranges, which are the low frequency, high frequency, or ultra-high frequency ranges. Working principles for LF and HF RFID tags are an inductive couple (near field coupling), while for the UHF RFID tags, it is electromagnetic coupling (far field coupling).