Fingerprint authentication is present in almost all operating systems these days and following suit, Google has also added fingerprint authentication to Chrome OS, according to this VentureBeat update.
Fingerprint authentication means you can log into your system simply by touching the fingerprint scanner. In Chrome OS you can scan up to 5 fingerprints. It means 5 people can use the authentication system to log into your chrome OS device.
In order to register fingerprint scanning into your Chrome OS you already need to be logged in using conventional method. Once you are logged in, you need to enable the “Quick Unlock” feature by going to chrome://flags (works on Chrome OS, not in every Google Chrome browser) on a Chromebook.