When you've had enough of an iPhone app or game, delete it to free up space in your phone's memory for the next app you want to try. There are a few ways to remove apps from your iPhone and one way to delete them from your computer's iTunes app library.
Remove Apps Using Your iPhone
To delete apps on your iPhone, tap and hold an app icon for a couple of seconds until all the icons begin to shake. Tap the X icon on each app you want to remove and confirm the deletion in the pop-up screen that appears. If an app doesn't have the X icon, the app came with iOS, and you can't remove it. After you delete all the apps you want to remove, press the Home button to stop the shaking.
This method removes apps from your phone, but if the app is also in your computer's iTunes app library, it won't erase it from your computer. The app will still sync with other iOS devices, and you can resync it to the iPhone from iTunes later.
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Remove Apps in iTunes Sync Settings
An alternate method uses iTunes to remove apps from your phone. Plug in your phone to your computer, click the iPhone icon in iTunes 12 and open the Apps tab. Click Remove by each app in the list that you want to remove from your phone and then click Apply to sync.
If you like the convenience of using iTunes to remove apps but prefer the iPhone interface to the app list, use the home screen images on the Apps tab. Double-click a home screen page or folder page to open it, mouse over an app and click the X on its corner.
Delete Apps From iTunes
Removing apps from your phone doesn't delete them in iTunes. If you don't think you'll want to use the app again on any iOS device, delete it from your iTunes library to recover drive space on your computer. Open the Apps tab in your library, right-click an app and choose Delete or select the app and press the Del key. When prompted, choose Move to Recycle Bin to erase the app and recover space.