This is the top most layer of the operating system containing all the apps that users interact with. Android applications run in their own Dalvik Virtual Machine and consist of many components such as activities, services, broadcast receivers and content providers. Components interact with each other in the same or different application via intents.
Various apps come pre-installed with android devices such as SMS client app, dialer, web browser, file explorer etc. There is a large community of developers who have come up with various types of applications such as games, document readers, social networks and various others
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