Calculus, sometime called the “mathematics of change,” is the branch of mathematics concerned with describing the precise way in which changes in one variable relate to changes in other. In almost every human activity we encounter two types of variables: those that we can control Calculus has enormous, but often unnoticed, impact on our daily lives. Here are a few areas of research where calculus is used extensively. All of these applications involve other branches of science and mathematics, but they all use calculus in some essential way.