Sometimes your Home screen is cluttered or you want to maybe organize it a little better. Hiding your app doesn't mean it is deleted, it is just stored in an icon folder, that is easily accessible from your Home screen.
This is how to hide an app if you don't want it displayed on your home screen:
How to hide:
Hide Apps on Your iPhone So Only You Can Find Them (iphonelife.com)
How to unhide: