If you're using a VPN, all of the data transmission is secured it before reaches the smartphone, whether from websites, applications, or iOS itself. This encrypted data is transmitted to a VPN company-owned server, in which it is decrypted and delivered on its path. A isn't just for encrypting online traffic.
All of the data you send to a remote server is secured with a public key cryptosystem. Students follow can and get more help to complete their education tasks. If an attacker gets into your system then he will be unable to intercept or decrypt any data that may be transmitted between you and your server.
I love this video in which the teacher is involving her students beautifully, the av aids displaying on the wall are very interesting and informative. Av aids are playing a very effective role in the learning process is also very helpful in learning methodology.