The difference between expository writing and argumentative writing is that the purpose of expository writing is mainly explanation, while the purpose of argumentative writing is mainly reasoning; Explanatory writing requires that the actual things or abstract things themselves be made clear, while argumentative writing requires that personal views or opinions be put forward on the object of discussion.

Explanatory words are also widely used. Instructions for the use of machines and electrical appliances, explanations of newspapers and magazines, dictionaries, dictionary notes, travel introductions, movies and dramas, etc. Need to explain the text. In addition, when we are writing a narrative, we often need to make necessary explanations about people, scenes and events, which also requires descriptive writing methods.