Hangeul (한글), Korea's official alphabet, was first invented by King Sejong during the Joseon Dynasty. Originally called Hunminjeongeum (훈민정음), the language was conceived in 1443, and further promulgated by the King in 1446. At the time of its inception, the language consisted of 17 consonants and 11 vowels however, since then, 3 of the originally established consonants and 1 vowel have fallen into disuse bringing the total number of characters to 24. Syllables are formed by the selective combination of vowels and consonants to create words.
The official name for the Korean language was changed to 'Hangeul' in 1910. Hunminjeongeum Proclamation Day was called 'Gagya Proclamation Day' up until 1926, and it wasn't until 1928 that it was changed to its current title, 'Hangeul Proclamation Day'.
chart below represents the 24 Hangeul characters
together with their romanized equivalents. 'The
Hunminjeongeum,' a historical document which provides
instructions to educate people on the use of Hangeul,
is registered with UNESCO. UNESCO awards a 'King
Sejong Literacy Prize,' every year in memory of
the inventor of Hangeul.