At one point, if you wanted to have secure digital communications between 2 points a private network would be created. This network would only allow the people that were intended to get the communications on it. This is very straightforward if the 2 points are in the same room or even in the same building. It can all be done physically. If you are supposed to be on the secure network

VPNs are an answer to one of today’s biggest concerns, how to make digital communications secure between to points that must communicate over the Internet which anybody can have access to