When Adroid 5.0, Lollipop was announced late in 2014, it came with several new features. Smart Lock allows users to bypass the device lockscreen when certain environmental conditions are met or set.
Smart Lock is built upon a new Lollipop feature called “trust agents.” True Agents, is a service that notifies the system about whether it believes the environment of the device to be trusted. Smart Lock, makes use of three options – Trusted face, Trusted places and Trusted Devices.
Allows the user to have their device memorize their face and “quickly” unlock their device without the need of entering your password. With Trusted Face activated, you can interact with your notifications and your phone or tablet will attempt to match your face and unlock without causing you any interference. If you want to unlock it before it has identified you, your lock screen will slide the security input up instead of attempting to identify you with Trusted face.