There are many methods used to secure a device, and the methods for bypassing each vary:

• None/slide
• Pattern
• PIN
• Password
• Smart Lock: Trusted Face, Trusted Voice, Trusted Location, Trusted Device, On-body Detection

Other security options may exist; as Android is open source, the possibilities are only limited by the developer's imagination. These are the options that are available in the stock version of Android Oreo released by Google. Most security options used by vendors generally use one of these stock options as a failsafe in case a user is unable to log in with their unique options. Versions in which the setting was first used also refer to stock Android; various manufacturers may have implemented them sooner.