How to Free Up Space on Your iPhone or iPad by Offloading Unused Apps

Apps can consume a lot of space on an iPhone or iPad. In iOS 11, a new feature allows you to remove an app from your device without removing the app’s data. In other words, you can remove the app and free up space without losing anything—when you redownload the app in the future, you can immediately  pick up right where you left off.

via: howtogeek.com