Apple unveiled Face ID back in 2017 with the introduction of the iPhone X. That iPhone was the first iPhone to have a modern, all-screen design. That design was achievable because Apple ditched the home button and replace that biometric authentication system with Face ID.
Face ID is Apple's modern biometric authentication system. That's quite a mouthful, right? So let's unpack it. An "authentication system" simply means the technology involved in the method used to verify a particular person can gain access to something.
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