Hanja
Although a phonetic Korean alphabet, now known as Chosŏn'gŭl or Hangul, had been created by Sejong the Great, it did not come into widespread official use until the late 19th and early 20th century. Thus, until that time it was necessary to be fluent in reading and writing Hanja in order to be literate in Korean, as the vast majority of Korean literature and most other Korean documents were written in Literary Chinese, using Hanja as its primary script. Today, a good working knowledge of Chinese characters is still important for anyone who wishes to study older texts (up to about the 1990s), or anyone who wishes to read scholarly texts in the humanities. Learning a certain number of Hanja is very helpful for understanding the etymology of Sino-Korean words, and for enlarging one's Korean vocabulary. Today, Hanja are not used to write native Korean words, which are always rendered in Hangul, and even words of Chinese origin—"Hanja-eo" ()—are written with the Hangul alphabet most of the time, with the corresponding Chinese character often written next to it in order to prevent confusion with other characters or words with the same phonetics.
Koreatown
Many modern Koreatowns will exhibit the usage of the Korean language and Hangul on storefront signs as sometimes on official highway signage. Officially sanctioned Koreatowns may also exhibit signs in the local language. In English, the word "Koreatown", "Little Korea", and "Korea Way" can sometimes be seen, as in the case with the Los Angeles Koreatown. As Korean is the official language of South Korea and North Korea as well as one of the two official languages in China's Yanbian Korean Autonomous Prefecture, there are approximately 80 million people who speak Korean worldwide. For over a millennium, Korean was written with adapted Chinese characters called hanja, complemented by phonetic systems like "hyangchal, gugyeol," and "idu". In the 15th century, a national writing system called hangul was commissioned by Sejong the Great, but it only came into widespread use in the 20th century, because of the "yangban" aristocracy's preference for hanja.