RFID - definition

RFID stands for Radio Frequency Identification. RFID can store very few amounts of data inside of the chip and can be sued for various purposes including security, identification, attendance, and so on. RFID tags are a smart label that usually stores number or patter or sequence or even short description. There are two main types of RFID tags are Active and Passive. Active tags are powered by a battery pack and can be read within a range of 100 meters and more. Active RFID tags are often used to track vehicles and in industrial operations. Passive RFID needs a very limited amount of power to get electronically activated and it receives that power from the reader. Passive RFIDs are often used in the market, ID cards, and similar other places. Many smartphones have the RFID reader in-built, few can even write.
Though there are security concerns in RFID tags because the stored data can be altered or copied easily. Hackers can easily break into one’s card and copy the information.