Calssic vs Modern Robots

Hello!

I was looking the documentation for the UiPath Migration Tool ( Using the Migration Tool (uipath.com)). On the list of what is/isn’t migrated there is a listed for Robots (classic) and Robots (modern). Are these just robots that are associated with classic/modern folders, or is there any specific documentation out there covering these? The best I could find was Standard and Floating Robots ( Robots (uipath.com)). Appreciate the help!