Mobile application file types and distribution

An IPA file, short for "iOS App Store Package," is used to distribute and install apps on iPhones and iPads. It holds everything needed to run the app, including code and assets. IPA files are designed specifically for Apple's devices and are part of Apple's closed system for app distribution. An APK file, short for "Android Package," is used to distribute and install apps on Android devices. It includes all the code, resources, and information needed for the app to run. APK files are open-source and work with various devices and Android versions, highlighting the flexible nature of Android's app distribution system.

IPA files are usually shared through the App Store for general public releases, TestFlight for beta testing, and Firebase App Distribution for early testing. On the other hand, APK files can be distributed via the Google Play Store for public releases, Bitrise for continuous integration and deployment, and also through direct downloads or other app stores. Each method is suited for different phases of the app's development and release.