A university essay can be thought of as an extended answer to a quite specific question that has been posed by your lecturer. A key consideration for lecturers when they mark students' work is whether the essay before them is relevant; that is whether it does in fact provide an answer to the question being posed.
For this reason it is important when you prepare to work on an essay that you spend a reasonable amount of time reading and mulling over the essay topic so that you understand precisely what is being asked. This involves identifying and thinking about key words in the topic, among other things.
This tutorial on essay writing is based on the following topic: