The main purpose of a passport is to serve as an official document that certifies an individual's identity and nationality for international travel. A passport contains personal information such as the holder's name, photograph, date of birth, and other identifying details. It allows individuals to enter foreign countries legally and to return to their home country. Moreover, it provides protection and assistance to travelers from their government while abroad. Passports often have strict security features to prevent forgery and ensure authenticity, and they are issued by national governments according to specific legal and procedural guidelines.