All Koreans speak and write the same language, which has been a decisive factor in forging their strong national identity. Koreans have developed several different dialects in addition to the standard used in Seoul. However, the dialects, except for that of Jeju-do province, are similar enough for native speakers to understand without any difficulties. Linguistic and ethnological studies have classified the Korean language in the Altaic language family, which includes the Turkic, Mongolic and Tungus-Manchu languages. The Korean Alphabet Hangeul, was created by King Sejong the Great during the 15th century. Hangeul, which consists of 10 vowels and 14 consonants, can be combined to form numerous syllabic groupings(in modern Hangeul, there are 11172 possible combinations, even though not all of them are used). Yet, it is simple, systematic and comprehensive, and is considered one of the most scientific writing systems in the world. Hangeul is easy to learn and write, which has greatly contributed to Korea's high literacy rate and advanced publication industry. 'The Hunminjeongeum', a historical document which provides instructions to educate people using Hangeul, is registered with UNESCO.
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