School composition is a type of writing assignment that is commonly assigned to students in school. It typically involves the student writing an ESSAY or paper on a given THEME or topic. The two main components of a school composition are the ESSAY and the THEME. An ESSAY is a piece of writing that is usually longer than a paragraph and is used to express an opinion, explain a concept, or tell a story. A THEME is the main idea or topic of the ESSAY, which the student must develop and support with evidence.