Procfile documentation

Hello, I find that there is a Procfile in the tutorial:
https://fly.io/docs/getting-started/python/#configure-the-app-for-fly

Can you explain more about that? Is there any difference with heroku’s Procfile?

Build packs can use Procfiles when they build images. We don’t have any special support for Procfiles, but that builder uses a build pack: Configuring Paketo Buildpacks - Paketo Buildpacks