Body Mass Index, a simple numerical value that relates an adult’s height and weight to categorize them as underweight, normal weight, overweight, or obese, serving as a general indicator of body fat and potential health risks associated with excess weight. 
If your BMI is less than 18.5 it is considered as underweight, if it is 18.5 – 24.9 it is considered as normal weight and if it is 25 or more it is considerd as overweight or obesity.
 It helps identify people who are at a higher risk for diseases linked to excess body fat, such as heart disease, high blood pressure, and type 2 diabetes.