The Thesis Statement of the essay is a sentence or statement that presents the main idea and argument you are making to the reader. The Thesis Statement also lets the reader know the order in which your ideas will be expressed. In the Thesis Statement, you are not merely trying to describe the material. You are taking a specific position that you will need to defend in your essay. The Thesis Statement is a writer/reader tool. It keeps the writer on topic while it lets the reader know what to expect to find in the essay.