Assistive Touch is an app that provides a virtual touchpad on your device's screen. To use this app, you need to enable two permissions. First, the app uses the Device Administrator permission to lock your device when you use the turn off the screen feature. To use this feature, you need to enable Administration in the app settings. Second, the app uses Accessibility services to perform various global actions, such as going back, going home, opening recent, power dialog, notification, and more. To use these actions, you need to grant the Accessibility permission in your device's settings. Once you turn on Assistive Touch, you can drag the AssistiveTouch menu to any edge of the screen and tap the menu to open it.