Your face became a password the moment a camera learned to measure the distance between your eyes

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Facial recognition technology works by converting the geometry of a human face, the distance between the eyes, the depth of the eye sockets, the shape of the cheekbones and jawline, into a mathematical representation sometimes called a faceprint. The process generally follows a set sequence, first detecting that a face is present in an image at all, then extracting and standardizing those key measurements, and finally comparing the resulting faceprint against a stored database looking for a match

This is why facial recognition can unlock a phone, verify identity at an airport, or flag someone against a security watchlist, all using the same underlying mechanism, just pointed at different databases for different purposes. It is worth distinguishing this from a related but different technology, facial characterization, which classifies a single face by estimated age, gender or emotional expression rather than trying to match it against any specific known identity, a distinction that gets confused constantly in casual reporting despite being technically quite different

The technology's rapid spread into airports, retail stores, law enforcement tools and everyday smartphones has come with real, ongoing debate, concerns about surveillance creep, documented accuracy differences across different demographic groups, and questions about how long faceprint data gets stored and who else might gain access to it. None of that debate changes the basic underlying mechanism though, which is fundamentally about turning an ordinary photograph into a comparable set of numbers, then letting a database do the matching

How Does Facial Recognition Work?www.csis.org