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Chapter 2. The Stack > Applications
2.6. Applications
And finally, there are the applications that you and other developers create. These applications are what end users find valuable about Android. They can come preinstalled on the device or can be downloaded from one of the many Android markets.
2.6.1. The APK
An application is a single application package (APK) file. An APK file roughly has three main components. An APK consists of the following major components:
