Many languages have their own way of expressing the sounds they use in communication.
In many cases, they borrow letters from other countries or develop them with time. A few peoples have invented their own writing system. Since I am a Korean, I am going to talk a little bit about the Korean writing system called 'Hangul', which means 'Great Letters'. Long time ago, we koreans borrowed Chinese writing system. Since spoken Korean differed much from spoken Chinese, only a limited number of elite group was able to read and write Korean.