Language and Knowledge Language is medium of expression in which knowledge is deciphered. Lang. is the outer form of content it express To process a language means to process the content of it. As computers are not able to understand natural language, methods are developed to map its content in a formal language. Language is taken up as knowledge representation The lang. and speech community considers language as set of sounds however here we are representing and processing only text. Language processing has different levels, each involves different types of knowledge.