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.
Names of Korea
European languages use variations of the name "Korea" for both North and South Korea. In general, Celtic and Romance languages spell it "Corea" (or variations) since "c" represents the /k/ sound in most Romance and Celtic orthographies. However, Germanic and Slavic languages largely use variants of "Korea" since, in many of these languages, "c" represents other sounds such as /ts/. In languages using other alphabets such as Russian (Cyrillic), variations phonetically similar to "Korea" are also used for example the Russian name for Korea is Корея, romanization Koreya. Outside of Europe, most languages also use variants of "Korea", often adopted to local orthographies. "Korea" in the Jurchen Jin's national language (Jurchen) is "Sogo". "Korea" in the conlang Esperanto is "Koreio". "Korea" in Hmong is "Kauslim". Within Spain, the Basque Country and Navarre regions use the spelling "Korea" in their Basque language, while the rest of the country uses "Corea", but this usage is related to national language politics rather than international usage.