What does edge mean?

  docker, question

I saw the official when I installed docker.DocumentIt was mentioned that

Optional: Enable the edge and test repositories. These repositories are included in the docker.repo file above but are disabled by default. You can enable them alongside the stable repository.

What kind of warehouse does this edge refer to? Is it newer or older than test, or is it more stable?

A picture will understand, that isEat chicken version
Edge gives you new features every month