What does P-passport mean?

Class P passports are ordinary personal passports.

Passports are divided into diplomatic passports, official passports and ordinary passports. Ordinary personal passport is a kind of passport issued by the national exit-entry administration department, which is mainly used for personal travel, visiting relatives, friends, study, work and other private affairs. Ordinary personal passports usually have three validity periods: one year, two years and five years, depending on the regulations of the issuing country. Holders of ordinary personal passports can arrive at the destination country at any time within the validity period, enjoying the convenience of traveling, studying and working.