What is Docker?

Docker Introduction

Docker is an open platform for developing, shipping, and running applications using containers.

— docker.docs

Consider the case where you build a Python application that contains a wide range of dependencies (legacy and latest). This Python application needs to be shipped to the production environment on different computers with different operating systems. You have to ensure that every computer has the same configurations as your local. Traditionally, doing it manually takes time and sometimes you may run into issues with different operating systems.

With Docker, you can easily manage your infrastructure like you manage your applications, because it will package all the application source code as well as the tools, libraries, settings, runtime, and dependencies that your application needs into a container. So, you can deploy your Python application with the same configuration and settings into each computer.