Although a phonetic Hangul, 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 to be literate in Korean, as the vast majority of Korean literature and most documents were written in Literary Chinese using Hanja as its primary script. A good working knowledge of Chinese characters is still important for anyone who wishes to study older texts (up to about the 1890s), 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 is 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 to prevent confusion with other characters or words with the same phonetics.