The explanatory or expository essay is an academic paper used to present reports. It is a critical reflection about a topic, where the writer establishes his thesis, his position or personal comment, includes a general statement or thesis and specific evidence to support it. The objective of the argumentative essay is to defend a proposed thesis, trying to convince the reader of this proposal. Use a cultured, formal and simple language. The ideas are presented in a clear manner, there being a logical relationship between them.