Some are for student to understand more and some are for teachers to see the students capability.
In the thesis at the beginning of the essay
The purpose of the essay is
By its very nature it is to end the essay and to summarize what you have concluded in the essay.
The purpose of an expository essay is to explain a topic. The essay can be an explanation about a demonstration, lecture, to clarify a process or to instruct a reader on how to do something.
The purpose of one kind of process essay, is to explain how to do something.
A compare and contrast essay's purpose is to analyze the difference and similarities of two subjects.
Answer a question.
in the thesis
The main points of your essay are in the body paragraphs. The conclusion - as the same suggests - concludes your essay by giving a brief summary of your essay or by coming to some conclusion based on what you have written in the body paragraphs
A qualifying essay is a type of essay with a purpose. This purpose usually involves challenging or defending a point. These are frequently used in dissertations.
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To explore an idea