There might be a situation where you wiped out all the apps and its data from your iPhone or iPad or iPod Touch and that you want to re-install the apps from your iTunes library with ease.
There’s a way for that. Apple has intelligently setup a way to install all the app on iTunes onto your iOS device with just one click. If you have only the required iOS apps that needs to be on your phone in your iTunes Library, and if you want to apps to be synced with your iOS device all at once, then all you need to do is to follow the steps given below.
Open up your iTunes when your device is connected to your computer. Then navigate to the devices’ page and then click on the Apps tab. Now, normally, when you click on Install for an app, it is going to install only that app will be installed. To install all the apps at one click, just press and hold Cmd button on the keyboard, and then click on Install on any app in the list.
These are the small things that Apple has with its products, but are not published as a feature.