How do I get offline maps?

Excuse me, could you please elaborate on how one might acquire offline maps? I'm curious about the process and any specific steps I might need to follow in order to have access to maps without an internet connection. Is there a certain application or service that you would recommend for this purpose? Additionally, are there any limitations or considerations I should be aware of when using offline maps, such as the level of detail or the area covered? Thank you for your assistance.