What does RFID stand for?
RFID stands for Radio Frequency Identification. Tags that reply with a stored identifier when energized by a reader's radio field, used in access badges, asset tracking and inventory. Passive tags need no battery. Badge cloning is a risk, so sensitive doors should use encrypted cards plus a PIN.
RFID identifies objects by radio. A tag, a small chip with an antenna, answers when a reader's signal reaches it and sends back its identifier. Passive tags have no battery and are powered by the reader's signal; active tags have their own power and reach much further. RFID is behind access badges, inventory labels, toll transponders and pet microchips. The security concerns are tags that answer any reader, which allows tracking, skimming and the cloning of simple badges.
RFID in practice: an example
A warehouse fixes a passive tag to every pallet. As a forklift drives through the dock door, a reader on the frame records all forty pallets at once, without anyone scanning a barcode or needing line of sight.
What RFID is confused with
RFID vs NFC: what is the difference?
NFC is a short-range form of RFID that works at a few centimetres and allows two-way exchange, as in contactless payment. Other RFID systems read simple tags from much further away. What NFC stands for
RFID vs barcode: what is the difference?
A barcode must be seen by the scanner, one item at a time. An RFID tag is read by radio, without line of sight and many at once.
Which exams cover RFID?
RFID is on the official CompTIA acronym list for one of the four exams covered here.
- Network+ N10-009: on the acronym list, not tied to one objective. Listed there as “Radio Frequency Identifier”.
Each number is a CompTIA exam objective and the name in brackets is its domain. The exam puts the term in a scenario; it does not ask you to recite the expansion.
Check yourself: two practice questions
Written by CertSprint for this page. They are not taken from any exam.
1. An employee's proximity badge is copied by someone who stood next to them in a lift with a concealed reader. What is this attack?
- RFID cloning
- Shoulder surfing
- Tailgating
- Phishing
Show the answer
A. RFID cloning. A simple proximity badge answers any reader with its identifier, which can then be written to a blank card. Shoulder surfing and tailgating involve no radio at all.
2. Which statement about passive RFID tags is correct?
- They are powered by the reader's radio signal
- They need a new battery every year
- They must be scanned with a visible laser
- They transmit continuously over several kilometres
Show the answer
A. They are powered by the reader's radio signal. Passive tags have no power source of their own and respond only when a reader energises them, which is also why their range is short.
Sources: NIST glossary: radio frequency identification; NIST SP 800-98, Guidelines for Securing Radio Frequency Identification (RFID) Systems. The acronym and its expansion come from CompTIA's official acronym lists, linked from each exam glossary above. The explanation, example and questions are CertSprint's own, checked against these sources on 11 November 2026.