I use ProtonMail for encrypted email. I like their services.
I have the VPN app on my phone, but do not use it too often. If you have it always enabled, you will likely notice a slow down of your data performance as it routes through their server.
It is most useful (on your phone) if you are connected through a Wi-Fi connection you perhaps don't trust or is public.
Here is a definition of VPN.
VPN stands for virtual private network. It is a private network that extends across a public network or internet. It enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.
When you connect to a VPN, you usually launch a VPN client on your computer (or click a link on a special website), log in with your credentials, and your computer exchanges trusted keys with a far away server. Once both computers have verified each other as authentic, all of your internet communication is encrypted and secured from eavesdropping.
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