"VPN literally stands for virtual private network. With a VPN, all your traffic is held inside a private, encrypted tunnel as it makes its way through the public internet. You don't access the destination until after you've reached the end of the VPN tunnel.
The root of why VPNs are popular is because they can be used to anonymize and encrypt internet traffic. Governments, ISPs, wireless network hackers and others can not only not see what's inside a VPN but also usually not even be able to find out who is using it."
https://www.lifewire.com/what-is-a-vpn-2377977