Eclipse RCP: Actions VS Commands

Question

What are differences between Actions and Commands in the context of Eclipse RCP? I know that they both contribute to the menu entries, but which one is better? And why?

Answer 1

Just adding to VonC's excellent answer, commands might be a little overkill if your application is relatively small. They are relatively harder to setup, and they shine the most when you have multiple perspectives, editors and views.

For something simple, I would go with actions.