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Docker is a tool used to create, deploy and run applications by using containers. Docker allows developers to package up an application with all the parts it needs. Containers are isolated from one another and bundle their own software, libraries and configuration file. Docker Hub is the official online repository where you can find other Docker Images that are available for use. The Docker Engine is a client-server based application. It is responsible for creating and managing Docker images, containers, networks and volumes on the Docker. It is referred to as a. REST API.