This document discusses integration by substitution, which is a technique for evaluating indefinite integrals. It explains the basic substitution formula f'(g(x))g'(x)dx = f(g(x))+C and covers recognizing when substitution can be used with polynomials and trigonometric functions. The document provides 8 examples of using integration by substitution to evaluate definite and indefinite integrals. Videos are referenced for additional explanation and demonstration of each step of the integration by substitution process.