BMI stands for Body Mass Index and is a widely used metric to assess an individual's body weight relative to their height. It serves as an indirect measure of body fat, categorizing individuals into different weight ranges, such as underweight, normal weight, overweight, and obese. While BMI is a useful initial screening tool for identifying potential health risks associated with weight, it does not directly measure body fat and may not account for muscle mass or distribution. Therefore, additional assessments may be needed for a comprehensive health evaluation.