Do you think that Virtual Private Server also known as VPS is a popular and a new concept? No it is an old concept of dividing a physical device, which is large and costly into many parts and allowing more and more people access to it at affordable price. It is just more than shared server and less than a dedicated servers. Virtual Private Server is similar to a building, which is divided into different flats, and each flat is independent unit having its own drawing room, kitchen and its own lock and key.
VPS is a hosting environment that gives you your own machine. Each VPS is a private and protected area that operates as an independent server. The VPS allows multiple customers to share the expense of hardware and network connections (and completely eliminate the hassle of maintaining it all) without sacrificing performance or the freedom to run whatever software they choose. Every VPS has its own complete directory structure and set of dedicated applications (web server, mail server, etc.). And each VPS can be rebooted without affecting any other VPS on the physical server.
Virtual Private Servers Known by different names Virtual Private Server, VPS, VPS...