Passport is a legal document issued by a country to prove the nationality and identity of its citizens when they enter and leave the country and travel or stay abroad.

The word passport means port pass in English. In other words, a passport is a passport for citizens to pass through international ports in various countries. Therefore, some countries in the world usually issue passes instead of passports.

Ordinary passport refers to the passport issued to ordinary citizens (that is, ordinary people). In China, there are two kinds of ordinary passports. One is the ordinary passport for business (purple), which is generally issued to graduate students, international students, visiting scholars and engineering and technical personnel sent by the state. This passport is issued by the Ministry of Foreign Affairs or the local foreign affairs office.

The other is an ordinary passport for personal reasons (purple), which is issued by the Ministry of Public Security or local public security organs authorized by the Ministry of Public Security to domestic nationals who go abroad or travel abroad for personal reasons.