People are connected to the Internet almost constantly these days. There's a good chance that the cellular phone you use has a constant data connection on it. If you carry a laptop with you, you're obviously doing so that you can flip it open and log onto the Internet for work or pleasure in remote locations. The problem with logging on over public networks is that you have no control over the security protocols that they have in place. This sometimes means that you end up exposing yourself to risks that you would never tolerate on a network over which you have control.
Learn more about VPN and how to connect the web and become hidden and ANONYMOUS.