The Fundamental Theorem of Calculus is the apex of our course. It explains the relationship between the derivative and the integral, tying the two major facets of this course together. In the previous section, you learned the definition of the definite integral as a limit of a Riemann Sum. The computations were long and involved. In this subunit, you will learn about the Fundamental Theorem of Calculus, which makes computation of definite integrals significantly easier.