The Per-App Tunnel Deployment allows both internal and public applications to securely access corporate resources that reside in your secure internal network.
It uses the Per-App capabilities offered by the operating systems such as iOS 7+ or Android 5.0+. These operating systems allow specific applications approved by the mobility administrators to access internal resources on an app-by-app basis. The advantage of using this solution is that no code change is required to the mobile applications. The support from operating system provides a seamless user experience and added security than any other custom solution.