A common use of the term “area under the curve” (AUC) is found in pharmacokinetic literature. It represents the area under the plasma concentration curve, also called the plasma concentration-time profile. The AUC is a measure of total systemic exposure to the drug.
Originally Answered: Why is it important to know the area of a curve in integral calculus ? The area under a curve will indicate a number directly related to the data. Depending on the problem you are solving, it will be a solution to a question.