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== The Android Software Stack ==
Android is structured in the form of a software stack comprising applications, an operating system, run-time environment, middleware, services and libraries. This architecture can, perhaps, best be represented visually as outlined in Figure 68-1. Each layer of the stack, and the corresponding elements within each layer, are tightly integrated and carefully tuned to provide the optimal application development and execution environment for mobile devices.
[[Image:android_studio_android_architecture.png|The Android Operating System architecture]]
Figure 68-1
