In this chapter, students will learn about definite integrals, their properties, and the various methods for evaluating them. They will explore the concept of the Riemann sum and its relationship to the definite integral, as well as the application of the fundamental theorem of calculus to simplify the calculation of definite integrals. Additionally, students will learn about the properties of definite integrals, such as linearity, the change of variable formula, and integration by parts, equipping them with the tools to solve a diverse range of integration problems.