This Tableau Public viz identifies the capabilities associated with the Viewer and Interactor Tableau Server License Levels.
It recaps the information found in this Tableau Knowledge Base article.
Instead of the KB's static HTML table the information is presented in a dynamic Tableau viz that encourages interaction, which leads to more engagement and better comprehension and retention.
I keep hoping that Tableau will start using Tableau to present information in its own online resources - doing so makes a lot of sense in the eating ones own dog food way. So far they're not seeming to see the value in it.