The document discusses thesis statements, including what they are, their purpose, and how to write them. It defines a thesis statement as a sentence that presents the main argument or point of an essay. Thesis statements can be open or complete. A complete thesis includes the main points that will be discussed in the body paragraphs. Strong thesis statements make a definite, debatable claim. The document provides examples of weak and strong thesis statements and a formula for writing a complete thesis statement. It also discusses how the thesis relates to the overall structure and argument of the essay.