The Docker is a tool intended to make it simpler to create, deploy, and run applications utilizing containers. Containers permit an engineer to package up an application with the entirety of the parts it needs, for example, libraries and different conditions, and deploy it as one package. Docker gives the capacity to package and run an application in an inexactly separated condition called a compartment. The segregation and security permit you to run numerous containers at the same time on a given host. You can even run Docker containers inside host machines that are virtual machines!
What is Docker?, and How It Works