Explain What is Docker Container with image?

Docker Container:

A running instance of docker container image.

Docker Container Image:

It is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.

Its basically a collection of file systems. It will have a ROOT FS, USER FS and one or more APP FS.

Can use single container image to run multiple containers.