Each file contains its own unique MD5 Checksum which is a string of values that’s different for each file. When a developer uploads their application to the app store, it’s uploaded as a. How Are These Apps Verified?ĪPK(Android Application Package) is the file extension given to all Android apps and is the main identifier when it comes to spotting an Android app. These Play Store alternatives will let you chose the version of the app and you can download the older ones in APK format, which can be directly installed on your device.
