BMI stands for Body Mass Index, a measurement that assesses body fat based on height and weight. It is a useful tool to gauge whether an individual falls into categories such as underweight, normal weight, overweight, or obese. While BMI provides a simple metric for evaluating health and weight status, it does not account for muscle mass or fat distribution, which are also important for understanding overall health. Therefore, it should be considered alongside other health assessments for a complete picture of an individual's fitness and well-being.