On a single physical server, VPS presents multiple server environments. Virtual private server bridge the gap between shared web hosting services and dedicated hosting services. It gives you total independence from other customers of the VPS service in software terms. It costs very less compare to a physical dedicated server. VPS provides the flexibility to add and change modules and install your own software. As a VPS runs its own copy of its operating system, customers have superuser-level access to the machine.
For example, a single physical server might have two virtual private servers running: one hosting the live (production-level) website, and a second which houses a copy of it. When updates to crucial parts of software need to be made, they can be tested in the other section provided as VPS, allowing for detailed testing to be conducted without the need of many other physical servers.
