This chapter introduces calculus. Calculus deals with the way in which quantities grow or change in relationship with each other. This chapter includes finding the derivative of a function, finding an integral, and some applications of derivatives, such as finding the local minimum and maximum of a function. Many readers will have covered this material before; this chapter will, therefore, represent a reminder for such readers. Doing the many exercises will help with that revision. For others, the many examples and exercises will aid in the learning process.