How to Download the Facebook App on Your Samsung Galaxy S 4
This is like downloading apps to your PC over the Internet. The screens show you the progress of downloading and installing the application.
This may happen so fast that you look away for a second and when you look back, it's done. Sometimes the Play Store offers you the option to keep on shopping while the app downloads in the background. If you like, you can watch the process in the notification portion of your screen.