The document provides an overview of the key elements of an essay, including:
1. An essay presents a writer's reflections and ideas on a topic in prose form. It can be on any topic and length.
2. The central idea or thesis may be directly stated or implied. Essays are also classified as formal or informal based on style, subject, and tone.
3. There are four main modes of writing essays: narration, description, exposition, and persuasion. Most essays follow an introduction, body, and conclusion structure.