A document, usually in the form of a booklet with multiple pages issued by governments to certify the bearer's identity and nationality for the purposes of travel.
A passport is a document issued by governments that certifies a persons identity and nationality for the purpose of international travel.
It is usually in the form of a booklet with multiple pages; one page being the identity page containing information about the bearer.
This tag should be used for all issues with passports such as issuing, re-issuing, renewals, types of passports and their validity.
Use the visa tag if your question has to do with the authorization to enter a country.