iOS 8.3 includes settings to download free apps and iTunes content without requiring a password.
Labeled as ‘Password Settings’, the new view allows users to configure how frequently Apple should ask for the user’s iTunes Store password for purchases. This includes allowing users to choose to allow free apps to be downloaded, no password necessary.
It allows users to download free apps (and other iTunes content) with no need to type a password. Paid content still requires authentication based on the options above.