This document defines and describes different types of outlines. It explains that an outline can be used to summarize a text, show how parts of a text relate to each other, and serve as a map or plan for an essay. The document discusses benefits of outlining, such as gaining an overview of a topic and testing one's understanding. It also defines two types of outlines - reading outlines made while studying a text, and writing outlines made before writing an essay. Finally, it provides examples of two main types of outlines - topic outlines and sentence outlines - and describes a traditional outline format.