
The official language of Korea is Korean. The Korean language is defined as “a language used mainly around the Korean Peninsula by the Korean people.” At present the Korean language is used by roughly 70 million people in both South and North Koreas and about 3.5 million ethnic Koreans living overseas.
The most prevailing theory is that the Korean language belongs to the Altaic language family.
A branch of the Korean language, which includes the Tungus language spoken from Siberia to the Volga River region, Mongolian, and Turkish.
Linguists consider the Korean language a part of the Altaic language family because Korean and other Altaic languages share certain structural features. Those characteristics include vowel harmony, initial sound rule, and the agglutinative nature of word derivatives.
Languages of South and North Koreas
A long period of division has widened the language gap between the two Koreas. In spite of the differences in vocabulary and usage and the coining of new words, the two sides have no problem communicating, so the language differences between the South and the North can be regarded as regional dialects. Nonetheless, linguists from both sides have worked to narrow the language gap.
Dialects
Dialects are classified by region. There are roughly six regional dialects in Korea.

Hangeul is Korea’s own unique alphabet.
Creation of Hangeul
Hangeul was created in 1443 (the 25th year of King Sejong’s reign) under the leadership of King Sejong the Great, the fourth king of the Joseon Dynasty, and proclaimed three years later in 1446. Hangeul was originally called “Hunminjeongeum,” which means “the right sounds to enlighten the people.” Hangeul is a phonemic alphabet composed of 28 letters - 17 consonants and 11 vowels – and each syllabic block is made up of at least two letters, a beginning consonant sound and a middle vowel sound, and, when necessary, an ending consonant sound.
Official script
Official documents were still recorded in Chinese characters even after Hunminjeongeum was proclaimed. A royal decree was issued in November 1894 to mandate Korean as the official written language of Korea. Thus, Hangeul became Korea’s official script 450 years after Hunminjeongeum was created.
Modern day Hangeul
The name “Hangeul” was coined by famed scholar Ju Si-gyeong in 1913. The term began to be used widely when a periodical titled “Hangeul” was published in 1927. Meaning “the writing of the Korean country,” “grand letters,” and “the greatest script in the world,” the term Hangeul and Huminjeongeum are threaded by a common theme. In accordance with the unified Hangeul spelling system established by the Joseon Language Institute in 1933, four letters were discarded from the original set, leaving 24 letters (14 consonants and 10 vowels) of today.
Structure
One syllabic block, composed of at least two of the 24 Hangeul letters, makes up one syllable. One syllable consists of as many as three sounds – beginning, middle, and ending sounds. Beginning sound: One of 14 consonants is used. The actual number of consonants that can be used for a beginning sound exceeds 14, because some consonants are doubled to form tensed consonants. Middle sound: One of 10 vowels is used. The actual number of middle vowel exceeds 10, because some vowels are in the form of diphthongs. Ending sound: Same as the beginning sound. Some syllabic blocks do not have ending sounds.
Characteristics
Hangeul is logical and easy to learn, since a consonant is always accompanied by a vowel to form a syllable.
Hangeul is recognized worldwide as the most scientific writing system. It is marked by the ingenuity and efficiency that comes from combining alphabet letters. Consonants and vowels are easily distinguished, and each syllabic block is arranged in a square shape to appear orderly. Hangeul is applauded as the most scientific script because the design of each consonant is modeled after the physical morphology of the mouth, palate, teeth and throat.