title: What is the difference between a Docker image and a container?
body: <p>When using Docker, we start with a base image. We boot it up, create changes and those changes are saved in layers forming another image.</p>
  
  <p>So eventually I have an image for my PostgreSQL instance and an image for my web application, changes to which keep on being persisted.</p>
  
  <p>What is a container?</p>