Information Technology Reference
In-Depth Information
The applications layer
This is the topmost layer where the user can interact directly with the device. There are two
kinds of applications—preinstalled applications and user-installed applications. Preinstalled
applications, such as Dialer, Web Browser, Contacts, and more come along with the device.
User-installed applications can be downloaded from different places, such as Google Play
Store, Amazon Marketplace, and so on. Everything that you see on your phone (contacts,
mail, camera, and so on) is an application.
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