Foreigners wishing to enter the Republic of Korea must, in principle, obtain an appropriate visa based on their intended purpose of stay. However, there are cases where entry without a visa is possible according to international agreements. A passport is an identification document that indicates the holder’s nationality and other personal details and is essential for international travel. This content provides legal information on visas required by foreigners intending to enter the Republic of Korea, ranging from the visa issuance to its extension, change, and loss, and on passports required by Korean citizens planning to travel abroad.