How Face ID Works... Probably - Computerphile?

Face ID is like having a super-smart fingerprint scanner that uses your face instead of your finger.

When you set up Face ID, the phone takes a bunch of pictures of your face from different angles, kind of like how a teacher might take photos of your class to remember everyone’s faces. These pictures help the phone learn what your face looks like in detail.

When you want to unlock your phone, it takes another picture of your face and compares it with the ones it learned earlier, like matching a puzzle piece to the right spot. If it matches well enough, the phone unlocks for you.

It’s kind of like when you wear glasses and try to recognize someone from across the room, sometimes you need a little help seeing clearly, but once you do, everything clicks into place.

Face ID is pretty good at this, even if you're wearing sunglasses or have a beard, it's like having a friendly robot friend who knows your face inside out!