What is the difference between a visa and a passport?

What is the difference between a visa and a passport?

I. Concept

A visa is a proof of a country's permission to foreigners, and a passport is a proof of a country's citizenship and nationality.

Second, the purpose

The main purpose of a visa is to enter a certain country, and it is a permit for foreigners to enter the country. The main purpose of passport is to prove one's identity and nationality when traveling or staying at home and abroad.

Three. Issuing authority

The final visa is issued by a foreign embassy or consulate of a country. Passports are issued by the Ministry of Foreign Affairs or passport issuing agencies.