A VM is a virtual machine or server which emulates a server(hardware ), It relies on the system’s hardware to stimulate the same environment which is installed on your applications. Majo use of System’s virtual machine that lets you exact computer software and applications alone in the virtual environment.

Earlier, Developers are used to creating virtual machines for all those purposes, but each virtual machine occupies a lot of space and is heavily configured. So docker comes in a picture with exceptional use on the same approach with a wide enhancement of virtual machine.