What is a VPN?
The simplest way to describing a VPN is to compare it to a normal network like your home network. In your home network you have 2 or more computers connected to each other by a physical device like a router. In a VPN, the 2 computers are connection via the internet. There is no physical device linking the 2 computers except for software running between the computers which makes it seems as if the computers are connected to the same network with a physical cable.
The connection between the 2 computers via the Internet would be unsecured and susceptible to anyone listening in. Furthermore the communication between the 2 computers is encrypted in such a way that only the computers on both ends can understand the communication.
What is a VPS?
Like VPN, software is required to create a VPS. It is a method of splitting a server into many other Servers. Each Virtual machine runs like a physical computer, completely isolated with it's own operating system and dedicated Hard drive space, RAM and CPU allocation. The VPS' can be rebooted individually and provides the features of a dedicated server except you are sharing the hardware on a very powerful server. Customers therefore get hosting services that are similar to that of dedicated Web hosting without sacrificing privacy, performance, and expensive costs.
What is A Private Cloud?
On a very basic level, A private Cloud would be considered to be a server that is hosting Virtual Machines. This means that Virtual Machine software is installed on it. Virtual Machine software like Vmware or Virtual Box is required to create VPS' on your Dedicated Super Server(private cloud). You have the liberty to create your own VPS and allocate resources as you please. Logically speaking, if the host Computer(Dedicated Super Server) only has 4 cores, and 4GB of memory, you probably wont be able to create many machines. A server with 16 cores or more and 32GB RAM would be sufficient to sustain up to 16 Virtual Machines or more. It all depends on the specs and the architecture of your setup.
I hope that gives you a better understanding of the entire concept of Visualization.
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