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Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.
Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and deploy it as one package.
Commands
Docker comes with 3 main components, docker, docker-machine, docker-compose.
At the time of this writing, I had the following versions
$ docker --version
Docker version 19.03.5, build 633a0ea
$ docker-machine --version
docker-machine version 0.16.2, build bd45ab13
$ docker-compose --version
docker-compose version 1.24.1, build 4667896b