An essay is a formal text that addresses a specific topic or theme through analysis, interpretation, or speculation. It has a clear structure consisting of an introduction, three main body paragraphs developing arguments or points, and a conclusion. Each paragraph also has its own structure, with a topic sentence, supporting details, and concluding sentence. To write an essay, one must first structure paragraphs around a central thesis before introducing the topic, developing arguments in the body, and concluding by restating the main idea without new information.