What is a VPS?

VPS (virtual private server or virtual dedicated server (VDS) - is a part of a physical server which operates almost as a dedicated server. With VPS you get features and benefits of dedicated servers at a lower price.
You have total control over your disk space, RAM and other resources on a server because all the virtual dedicated servers are completely separated from each other.
Each virtual server can run its own full-fledged operating system, and each server can be independently rebooted. In simple - VPS is a server that runs inside a server.