South Korea ( listen), officially the Republic of Korea (Korean: 대한민국; Hanja: 大韓民國; Daehan Minguk listen; lit. "The Great Republic of Han"), is a country in East Asia, constituting the southern part of the Korean Peninsula. The name Korea is derived from Goryeo, a dynasty which ruled in the Middle Ages. It shares land borders with North Korea to the north, and oversea borders with China to the west and Japan to the east. South Korea lies in the north temperate zone with a predominantly mountainous terrain. Roughly half of the country's 50 million people reside in the metropolitan area surrounding its capital, the Seoul Capital Area, which is the second largest in the world with over 25 million residents.
The Korean Peninsula was inhabited as early as the Lower Paleolithic period. The history of Korea begins with the founding of Gojoseon in 2333 BC by the semi-legendary Dangun. Following the unification of the Three Kingdoms of Korea under Silla AD 668, Korea was ruled by the Goryeo Dynasty (918–1392) and Joseon Dynasty (1392–1910). It became part of the Japanese Empire in 1910. At the end of World War II, Korea was divided into Soviet and U.S. zones of occupation, with an election in 1948 leading to the creation of the Republic of Korea. Although the United Nations passed a resolution declaring the Republic to be the only lawful government in Korea, a communist regime was soon set up in the North that invaded the South in 1950, leading to the Korean War that ended de facto in 1953.
Between 1962 and 1994, South Korea's tiger economy grew at an average of 10% annually, fueled by annual export growth of 20%, in a period called the Miracle on the Han River that rapidly transformed it into a high-income advanced economy and the world's 11th largest economy by 1995. Today, South Korea is the seventh largest country in international trade and a founding member of the G-20 and APEC. Civilian government replaced military rule in 1987 and the country has since evolved into Asia's most advanced democracy as rated by The Economist's Democracy Index. In 2009, South Korea became the world's first former aid recipient to join the OECD's Development Assistance Committee, becoming a major donor. Its pop culture has considerable influence in Asia and expanding globally in a process called the Korean Wave.
South Korea is a developed country ranked 12th in the Human Development Index, while in terms of average wage, Koreans are Asia's highest paid and the world's 10th highest paid. It ranks highly in education, quality of healthcare, rule of law, ease of doing business, government transparency, job security, tolerance and inclusion. 64% of 25-34 year old Koreans hold a tertiary education degree, the highest in the OECD. A world leader in innovation as measured in the Bloomberg Innovation Quotient, South Korea is the world's sixth largest exporter, driven by high-tech multinationals such as Samsung, Hyundai-Kia and LG. South Korea has global leadership in advanced technology such as the world's fastest Internet connection speed, ranking first in the ICT Development Index, e-Government, 4G LTE penetration and second in smartphone penetration.