@konstruct VPN is literally whatever classifies as a Virtual Private Network.A VPN could be a fake overlay network that allows you to connect to a gateway (router) hosted on some company's server so that all your internet traffic is routed there (what you're probably thinking of as the commercial variety)Or it could just be a way to connect to your home devices that are on the same VPN, or all of your home if the VPN endpoint you connect to also routes to the LAN there..or both at once.