"하" is a Korean character that represents the sound "ha." It is the first letter of the Korean alphabet, known as Hangul, which was created in the 15th century by King Sejong the Great. The character "하" can also function as a verb meaning "to do" in the Korean language, making it a fundamental part of many sentences. In addition to its linguistic significance, "하" appears in various contexts, such as in names and expressions. For example, it is often used in greetings like "안녕하세요" (annyeonghaseyo), which means "hello." Understanding "하" is essential for anyone learning Korean as it forms the basis for constructing sentences and communicating effectively.