What is the difference between “expose” and “publish” in Docker?

Question

I\'m experimenting with Dockerfiles, and I think I understand most of the logic. However, I don\'t see the difference between \"exposing\" and \"publishing\" a port in this

Answer 1

You expose ports using the EXPOSE keyword in the Dockerfile or the --expose flag to docker run. Exposing ports is a way of documenting which ports are used, but does not actually map or open any ports. Exposing ports is optional.

Source: github commit