Somatotype is a classification system that categorizes human body types based on physical characteristics. Developed by William Sheldon in the 1940s, it identifies three primary body types: ectomorph, mesomorph, and endomorph. Ectomorphs are typically slim and lean, mesomorphs are muscular and well-proportioned, while endomorphs tend to have a rounder physique with more body fat. This system is often used in fields like fitness, nutrition, and psychology to understand how body types can influence physical performance and health. While somatotype can provide insights, it is important to note that most individuals are a combination of these types rather than fitting neatly into one category.