What is the difference between a Mediterranean cruise and a Greek Isles cruise?

Greece is, of course, on the Mediterranean Sea and many of our Mediterranean cruises visit Athens and even one or two islands. But, while our Med cruises always include iconic cities and countries like Italy, Spain, France and more, our Greek Isles cruises focus more on islands like Mykonos, Santorini, and Corfu plus the coastlines of Croatia and Turkey.