"가" is a Korean character from the Hangul writing system, which is used to write the Korean language. It is the first letter of the Korean alphabet and represents the sound "ga." Hangul was created in the 15th century by King Sejong the Great and his scholars to promote literacy among the Korean people. In addition to being a letter, "가" can also function as a grammatical particle in Korean. When used as a particle, it indicates the subject of a sentence. This dual role makes "가" an essential component of both written and spoken Korean, contributing to the language's structure and clarity.