A paragraph, like a sandwich, has three components or layers: a main statement, supporting elements, and a finishing sentence. The top piece of bread is a subject sentence. It states the main idea of the paragraph and is not included as part of the supporting evidence. The next piece of bread is the supporting evidence. It can be an explanation or example to help understand the topic being discussed. This piece of bread should relate directly to the main idea or topic being addressed in the paragraph. The last piece of bread is the concluding sentence. It brings everything together by summarizing the paragraph's main point and introduces any new information needed by the reader. This piece of bread should also tie back into the topic being discussed in the paragraph. Paragraphs are used in essays because they can include multiple ideas or topics while still keeping them separate. With this in mind, it is important that each component of the paragraph supports the ideas presented earlier in the essay or paper. If one section of the paragraph does not follow this rule, then it may cause confusion for the reader. Furthermore, paragraphs are useful tools for readers to navigate through long documents such as papers and books. If there is too much text on one page, it can be difficult to find specific points.