Way of using resources In the case of shared hosting, websites and / or applications residing on the server make use of resources and available server capacity at the same time. In the case of VPS hosting, each websites and / or applications residing on the server is being allotted a virtually distinct server. Here a separate, exclusive server is often rented.
A VPN server is a machine on the internet that runs VPN software. A VPN client can connect to that server, and all data that travels between the client and the server is encrypted. If you wanted to connect to a website on the internet but didn’t want anyone, even your ISP, to see which site it was or the data your were sending, you could connect via a VPN. All an observer would be able to see is that you connected to the VPN server.