What's the difference between a Cosmo and a Cosmopolitan?

Could you please explain the distinction between a Cosmo and a Cosmopolitan? I've heard both terms used interchangeably in some contexts, but I'm curious if there's a specific difference between them. Is it simply a matter of regional preference or is there a more substantial difference in their composition or taste? Additionally, are there any other cocktails that are similar to these two drinks and might be worth trying? I'm always interested in exploring new and exciting drinks, so any recommendations you have would be greatly appreciated.