Jun 16, 2016 - 08:38 PM
Android application package (APK) is the package file format used by the Android operating system for distribution and installation of mobile apps and middleware. The files that contain the .apk file extension store the files that are needed to run a single Android application on an Android mobile device. A way to install an application on your Android is to download an APK file first.Then open it with the file manager on your phone.Follow the instructions and you will have a new application.
You may have lots of applications on your Android,to manage them,I recommend to you Power Clean(https://goo.gl/wWvNPc),a very powerful tool helps you clean up your phone,make it more smoothly without impact on normal use.