title: If I run `docker-compose up` do I need a Dockerfile in the directory as well as a docker-compose.yml file?
body: <p>Do I absolutely need to have a Dockerfile in my directory when using the command <code>docker-compose up</code>? I don't believe a Dockerfile is necessary but want to be sure.</p>
  
  <p>If I only have a docker-compose.yml file using pre-built images, there would be no need for a Dockerfile. </p>
  
  <p>Correct me please! Thanks in advance.</p>