Use of App Launcher Namespace in Salesforce

The AppLauncher namespace provides methods for managing the appearance of apps in the App Launcher, including their visibility and sort order.
The following class is in the AppLauncher namespace.
AppMenu Class
Contains methods to set the appearance of apps in the App Launcher.
CommunityLogoController Class
Represents the logo of the community. For internal use only.
EmployeeLoginLinkController Class
Represents the link on the login form that employees can click to log in. For internal use only.
LoginFormController Class
Represents a login form. For internal use only.
SocialLoginController Class
Represents the social authentication providers configured for the community. For internal use only.