How face recognition works?

I was asked this question in my last interview and here is a short and crisp answer of this.

A face recognition is a biometric solution which recognizes human face without physical contact required.

It runs through an algorithm that matches facial nodes to images saved in database.

It first recognizes unique features like nose, eyes, Iris, nose width and length, lips, cheeks, eye brows, jaws etc.

We extract these features from image than compare in database

Its accuracy is …

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