5. But it's clear when people say "having multiple passports" they're referring to dual citizenship, right?

A passport is a travel document, in the form of a blue, burgundy, green or black booklet.

Here's an incomplete list of people who can have multiple passports without being a multiple citizen:

1. Vintage passport collectors

2. Holders of valid passports issued to non-citizens of the issuing country (see examples above)

3. Citizens of only one country with multiple valid passports from the same country

4. Citizens of only one country with a valid passport and expired passport (which may be used as ID or proof of citizenship even if not valid as a travel document anymore).

(6/8)