VPN, as a technology, was originally created as the most reliable means of transmitting traffic - from the transmitter to the receiver. And for a long time it was a complex of various programs, each of which was responsible for its own. But today's VPN services do not require users to know the rules for building packages in linux. You can simply download them, install them in a couple of clicks, and get the result. Thus, VPN today is a special add-on over the operating system iOS, Android, Windows, macOS. With a VPN, you can defend against most online threats.