Korean reunification refers to the hypothetical future reunification of North Korea

North Korea

The Democratic People’s Republic of Korea , , is a country in East Asia, occupying the northern half of the Korean Peninsula. Its capital and largest city is Pyongyang. The Korean Demilitarized Zone serves as the buffer zone between North Korea and South Korea...

 and South Korea

South Korea

The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

 under a single government. The process towards this was started by the June 15th North-South Joint Declaration

June 15th North-South Joint Declaration

The June 15th North–South Joint Declaration was adopted between leaders of North and South Korea in June 2000 after various diplomatic meetings between the North and South...

 in August 2000, where the two countries agreed to work towards a peaceful reunification in the future.

However, there are a number of difficulties in this process due to the large political and economic differences between the two countries and other state actors such as the People's Republic of China, Russia, Japan, and the United States.