"Descriptive essay" is a tricky term, because "essay" means "to try"; that is, the essay form seeks to persuade or convince based on gathered evidence and rhetoric, while "to describe" does not appear on the surface to be argumentative. But a descriptive essay is one which organizes observations into categories. Examples are : high school experiences (which can then be broken down into education, social, sexual, career choices, future goals, or something like that); advertising (media, target audience, measurement of effectiveness, etc.); conservation efforts (recycling, biodegradable substances, farm waste, etc.); astrophysics (astronomy, measuring techniques, probabilities of life, mathematics of mass and energy, etc.); world events (border conflicts, religious influences on government, economies, hegemonies, ethnic problems, etc.); toys (kinds, history, age appropriateness, tie-ins to movies, etc.) Each of these categories are simply examples of areas of description--the real challenge of the descriptive essay is taxonomy and expression of the areas of inquiry.