Chapter 12, Zappa with Docker

1. A Docker container is a virtual instance of a basic Linux system that enables you to perform operations in an isolated environment. Docker container has all basic configurations such as networking, filesystem and OS level utilities. 
2. A Docker image is an actual OS image with the required packages. You can also create your own image and publish it on the Docker repository. A Docker container is an instance of the Docker image. You create N number of containers using a Docker image.