As an acronym for Virtual Private Server, VPS is a type of hosting many businesses and digital publishers move on to after outgrowing their shared hosting plans. It is also referred to as a virtual dedicated server, or VDS Hosting. VPS hosting offer increased control and provide you with the ability to perform more advanced functions with your website. Unlike shared hosting, VPS server space is split up into self-contained units.
Users of Shared hosting all share the resources on the server their websites are on. There is no guarantee of RAM or CPU with Shared hosting. Shared hosting also does not provide full root access to the server, as opposed to VPS package where users are given full root access to perform commands and make configuration changes to their hosting environment.
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.
A VPS runs its own copy of an operating system (OS), and customers may have superuser-level access to that operating system instance, so they can install almost any software that runs on that OS. For many purposes they are functionally equivalent to a dedicated physical server, and being software-defined, are able to be much more easily created and configured. They are priced much lower than an equivalent physical server. However, as they share the underlying physical hardware with other VPSes, performance may be lower, depending on the workload of any other executing virtual machines.