Lock screen is a security feature provided by many mobile operating systems in mobile devices.
This feature prevents unauthorized access to the device.
This feature does not allow the mobile to be used unless the user performs a specific action rightly in order to get access of the mobile device.
This action can be entering the correct password, pin-code, pattern.
These days, the lock screen with new enhanced security features enables the users to unlock the mobile device using gestures like face recognition and also provides fingerprint lock feature that locks and unlocks the mobile device with the fingerprint of that device user.
Its a good practice to set the lock screen in a way that it locks the device if it remains idle for specific time and the user is required to enter the password etc to unlock it.
Lock screen is a beneficial feature when it comes to the security of the device and the data stored in it.