Perhaps the defining characteristic of the iPhone X is its facial scanning capabilities, or Face ID. Geared primarily toward securing your device — and basically ensuring no one else can get past your lock screen — Face ID uses "advanced depth-sensing technologies" that become accustomed to the intricacies of a user's face over time. The iPhone 8 and 8 Plus, on the other hand, offer the standard fingerprint sensor built into the Home button.
What's more, the technology is compatible with Apple Pay and many third party apps, so you'll certainly need to depend on it, especially in lieu of the Home button, which is nowhere to be found on iPhone X. Moreover, FaceID is designed specifically to circumvent attempts to infiltrate your device by imposters — you know, like someone wearing a mask or using a photo of you. To make all of this work, the phone projects tens of thousands of dots, combined with an infrared camera and an ambient light sensor to memorize your face.