Generally, there are four types of writing styles: narrative, descriptive, expository and argumentative writing. Literary essays usually use the narrative and descriptive style of writing while academic essays usually employ the expository and argumentative types. Expository writing is the best technique you can use if you wish to inform your readers some specifics about a certain topic. Expository writing is used when you aim to deposit information to your readers by explaining a concept, principle or a process. The key to discovering when to use this technique is on the essay assignment itself. Professors who ask you to elaborate, analyse, assess, define, discuss, evaluate or illustrate a certain concept will want you to write an expository essay. In expository essay writing, you have to make sure that you were able to answer the essay question