Special access: Optimize battery usage for individual apps, enable device administrator apps, choose apps that can appear over other running apps, select which apps can change system settings, and more.
Reset app preferences: Reset options that have been changed. Existing app data is not deleted.
Note: Options vary by application.
Manage Apps
You can view and update information about an application, including memory usage, default settings, and permissions.
1.From home, tap Apps 
> Settings 
> Apps 
.
2.Tap an application to view and update information about the application. The following options are displayed:
Uninstall/Disable: Uninstall or disable the application. Preloaded apps can only be disabled.
Force stop: Stop an app that is misbehaving. Restart your device if stopping an app, process, or service causes your device to stop working correctly.
Mobile data: View mobile data usage.
Battery: View battery usage since the last full charge.
Storage: Manage the app’s storage usage.
Memory: View memory usage.
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