VPN is a proven way to securely connect to the internet anywhere in the world. Companies and businesses use it for secure, remote access to corporate servers while individuals use it to protect their online activities and surfing habits from prying eyes.
It works on all wireless networks and encrypts your internet connection in addition to masking your IP address. This insures greater privacy, stable network performance and stronger tablet security.
In earlier iterations of iOS (up to iOS 6), when you enabled VPN on your iPad, it did so for all apps on your tablet. There was no way to customize or restrict internet access to just a few apps of your choosing.
With iOS 7, you can decide which apps you want accessing the VPN. In other words, you can selectively grant permissions to certain apps to access the internet and/or the VPN network while simultaneously restricting other apps.
This helps with a number of usability benefits ranging from custom web security, to better internet & network traffic management, to setting up parental controls on your iPad.