1: Locate the app
In iTunes, find an app that you want to give to someone, then click on Buy App and, from the drop-down menu, choose Gift This App.
2: Enter the details
In the next screen, enter your name and the email of the person you’re sending to. Click Continue and iTunes will ask you to confirm the payment.
3: Get the email
Find the email on the iDevice. If you have received it on your Mac you can forward it and then open it on the iPhone. Click the Redeem Now button.
4: Sign in
Your iPhone will open iTunes and you may well be asked to sign in. The app will begin downloading in the background automatically.
5: View the app
Come out of the iTunes app and you should see the app has downloaded to your phone. Fire it up to check that it works okay.