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APK or the "Application Package Format" is the standard file format used for distributing and installing applications on Android devices. It is a variation of the .JAR format, which is used for Java archives.
APK files typically contain the following files and folders:
META-INF folder - contains manifest and cerficiate files
res folder - contains application resources
APK files are usually created with the Google Android SDK. The contents of an APK file can be extracted and installed by the Android operating system.