1. Biometric technology

2. What is biometric technology?
Biometric verification is any means by which a person can be uniquely identified by evaluating one or more distinguishing biological traits. Unique identifiers include fingerprints, hand geometry, earlobe geometry, retina and iris patterns, voice waves, DNA, and signatures.

3. Facial Recognition
Facial recognition Like all biometrics solutions, face recognition technology measures and matches the unique characteristics for the purposes of identification or authentication. Often leveraging a digital or connected camera, facial recognition software can detect faces in images, quantify their features, and then match them against stored templates in a database.
Face biometrics have the potential to be integrated anywhere you can find a modern camera. Law enforcement agencies the world over use biometric software to scan faces in CCTV footage, as well as to identify persons of interest in the field. Border control deployments use face recognition to verify the identities of travelers. It even has consumer applications.

4. Iris Scans
Iris scans are the most accurate form of biometrics (identity checking based on sophisticated body measurements)—far superior as a form of identification to fingerprints (which can wear out in time) or DNA profiling (which isn't instant).
They can be used at cash machines and airports.

5. Everyone has a unique, unchanging fingerprint
Everyone has a unique, unchanging fingerprint. A fingerprint is made of a series of ridges and furrows on the surface of the finger and these are used to determine the uniqueness of the fingerprint. Once registered on the fingerprint scanner, the image of these patterns is converted into a code through a mathematical sequence called an algorithm which effectively becomes a digital form of you. This is stored on a database for comparison which grants authentication and access through the secured door.
They are used on phones, devices and cash machines.