Korean (Hangul: 한국어; Hanja: 韓國語; Hangugeo) is a language spoken by all the people in Korea and a few million other people all over the world, especially in the United States, China, and the former USSR.
It is written in the Hangul alphabet, which was created by King Sejong in the 15th century to increase literacy. However, hangul wasn't formally adopted until the early 20th century. Sometimes, Korean uses Chinese characters (hanja), which are most commonly used in personal names on name tags and signs and historical texts. They are also used to specify the meaning of certain words because the corresponding writing in Hangul is unclear.