I call them Editor styles and Compile Styles. (Both are formatting styles, after all, and neither requires yo to use the Format bar all the time.) You may want to format a document, paragraph, or character style one way in the Editor and another way in Compile. You could want a style to be justified in Compile, but unjustified in the Editor, for instance … or you want indentation, fonts, or anything else to be different.
You can define everything in the Compile menus, in a couple of ways. Click on the dropdown for line spacing and click on Other... to reach before & after settings. Or you can click in the Format menu to do it (on the Mac at least; can’t remember if Windows allows it).
Compile styles have extra capabilities, too. Here’s an example: