The purpose is to educate on a certain topic they must not be used to express an opinion, or to convince and to remain objective
Introduction 
This should include the thesis thesis, is the main idea you wish to get a Cross
The theater should be very clear, and be written in one sentence which inform the reader of the contents of the essay
Introduce the main idea
Provide relevant definition
Body of the essay
They should expound upon the thesis statement of the essay
Provides facts. Statistics and statements provides further detail about the main idea, and delve into the ideas mentioned in the introduction.
Conclusion
Summarize ideas within the essay
Encouraged Weider to want to read more on the topic
Reiterate what was learned in the thesis statement