Chapter 2: The Architecture of the Android Operating System
An Android operating system, regardless of version number, is composed of five
software components. They are the Linux kernel, libraries, Android runtime,
application framework, and applications. In case that you are familiar with
operating systems, Android is based on Linux, which is also based on UNIX.
As an FYI, iOS is based on OS X, which is another operating system based on
UNIX. Technically, you can consider iOS and Android as cousins.
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