Sikandar khan submitted an essay on different types of essays for his 3rd semester Sociology course. The document defines an essay as a short academic composition derived from the French word "essai" meaning "trail". It then provides definitions and guidelines for writing narrative, descriptive, expository, and argumentative essays. For each type, it outlines their purpose and focus, as well as tips for incorporating key elements into the writing. The document serves as a reference for students on developing different essay formats and structures.