Это используется, чтобы получить список всех приложений, и пользователь может запустить / удалить там себя
Its an application tool using which user can view list of all the applications/apk's installed in their mobile. Also on longclicking on the item a menu will be popped up for the user with options launch/un-install, based on the user's interest, can either launch or un-install the application.
Sometimes when we install the app, we will not be knowing where exactly the app went, this happens for those who do not know much about the smart phone normal functionality/usability. Using this application they can know the installed applications, also on long clicking on the app they can either launch or uninstall the app.