Docker Understanding

What is Docker?
Docker is a platform to create or have containers, consisting of Kernel and OS and required HW.
What is Container
AS definition container is lightweight runtime environment provided by Docker
containers are to build, deploy, test, run the applications. which contains all necessary isolated environment setup like network, PID, rootFS, to run the app.

How Docker work?
Docker Engine have client and server which communicate with each other using API.
How Container work?
Containers provide all the packages and dependencies a application required, uses a base image to supply the libraries and dependencies to container. In genral with one image you can get a container using command docker run image-name by attaching pid,ns, mnt to a user.

What are the components of Docker?
Docker Engine, Docker Images, Docker Registry, Docker Container