Fingerprint scanners on phones have come a long way since the Motorola Atrix introduced us to them. Thankfully, a really long way. While everyone thinks of them as a cool way to unlock your phone, that's not exactly how they work on the Nexus 6P and Nexus 5X with Android 6.0 Marshmallow.
Nexus Imprint (that's what Google calls its implementation of Marshmallow's fingerprint scanning and reading APIs) grabs your fingerprint and saves associated data about it (encrypted, of course) to the system, where it can be used to authenticate just about anything. Including your lock screen. It has the data from when you set it up, and if the data you supply when you use your finger matches, it authenticates — says that yes, you are really you. Things like lock screens, or password managers or PayPal can let you in because they know that you are who you claim to be, and the rightful owner of the device.
This means setting up Nexus Imprint is important if you'll want to do things with your fingerprints.
Here's how it's done.
Crack into the settings on your new Nexus, and look for the "Security" line under Personal. Tap it. About halfway down, you'll see the entry for Nexus Imprint. You know what to do, tap tap.
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