What is XAPK File? How does it work?
XAPK is another package file format used on the Android operating system to install mobile applications and middleware. It's somewhat similar to the APK format but also different.
XAPK file = APK file + OBB data file
XAPK file = Base APK file + Split APKs file, The base and split configuration APKs contained in this APK bundle
Similar as APK and XAPK are, the installation processes of the two differ a lot. The XAPK is harder to install and can cause a big headache if you don't use a handy tool (Apkpure).
What is APK File? How does it work?
APK is the acronym for "Android Package", which is a package file format most widely used by the Android operating system for distribution and installation of mobile apps and middleware.
How to install unknown sources Apps APK file to Android
Out of the box, your Android device only allows you to install apps from Google Play Store. To install software anywhere else, you have to enable installation from third-party sources. That is, enable the “Unknown Sources” setting.
This will enable you to install apps from sources other than the Play Store.
You may need to adjust this according to your Android models. For some users, simply go to Settings -> Security and make sure Unknown Sources is checked. Sometimes you meet the problem of can’t downloading apps.