An APK (Android Package Kit) is the file format used by the Android operating system to distribute and install mobile apps. It contains all the elements an app needs to function on a device, including the code, resources, and manifest file. APK files are typically downloaded from the Google Play Store but can also be installed manually. Developers use them for testing apps before release. Users should be cautious when installing APKs from unknown sources to avoid security risks. https://modsapk.org