It consists of 3 things:

• Docker client
• Docker Host(Docker daemon)
• Docker registry(Docker Hub)

Docker client is the user interface for interacting with Docker.

It is the tool we use to give Docker commands.

Think of the Docker client as a chef giving instructions to the Docker stuff.

Docker registry is the centralized repository of Docker images. It hosts the private and the public packages.

Docker is like Git.

Docker registry is like GitHub.