A more thorough explanation:

A passport is an official document that proves a person's identity and citizenship. It allows the person to travel to and from foreign countries.

For example, if you want to travel to another country, you need a passport to show who you are and where you come from. Without a passport, you may not be allowed to enter another country.

A passport does not give you the right to travel in another country, but it requests that other governments allow you to travel in their territories. It also entitles you to the protection and assistance of your own diplomatic and consular officers abroad.

Overall, a passport is an essential document for international travel and serves as proof of your identity and citizenship.