BMI, or Body Mass Index, is a numerical value derived from an individual's height and weight, used to categorize them into different weight status classifications, such as underweight, normal weight, overweight, or obese. It is calculated by dividing an individual's weight in kilograms by their height in meters squared (kg/m²). While BMI is a useful screening tool for identifying potential weight-related health risks, it does not account for factors like muscle mass and fat distribution. As such, it should be used in conjunction with other health assessments for a comprehensive evaluation.