APK (Application Package File)

Android application package file (APK) is the file format used to distribute and install application software and middleware onto Google's Android operating system, very similar to an MSI package in Windows or a Deb package in Debian-based operating systems like Ubuntu..

1. To make an APK file, a program for Android is first compiled, and then all of its parts are packaged into one file..
2. An APK file contains all of that program's code, resources, assets, certificates, and manifest file..
3. APK files are ZIP file formatted packages based on the JAR file format, with .apk file extensions..