About this interactive
A badge or fob can be duplicated, lost or stolen. What cannot be lost or stolen is your thumb. Biometrics identifies you by something about your body, the way you were made, that is unique to you: a fingerprint, your eyes, your face. A reader scans it and grants access from it.
RFID, radio frequency identification, is the technology inside key fobs and badges. A small tag is read by radio, without contact, and identifies whatever carries it. The same idea tracks things: the lesson's race timing chip starts and stops each runner's clock as she crosses the mats, and tags on goods or equipment are read as they pass.
To sort a card, ask what is being identified: the person's body, or a tag the person or thing carries.
About TechKnowSurge
TechKnowSurge builds IT and cybersecurity professionals through hands-on, concept-first training built around real understanding — not memorization. Free interactive tools, structured programs, and 25+ years of real-world experience, all in one place.
Explore free tools and programs →