What are the two types of mantle?

Excuse me, I'm a bit puzzled about something I've read recently. Could you please clarify for me the two types of mantle mentioned in the paragraph? I'm trying to wrap my head around the intricacies of this subject, but I'm finding it quite challenging. Would you mind explaining the differences between these two types? Also, if you could provide any real-world examples or scenarios where these mantles might be used, that would be extremely helpful. I'm eager to learn more about this fascinating topic.