This text is written for students preparing for a career in business, economics, psychology, sociology, architecture, or the life, social, environmental, or physical sciences. It is assumed that these students have completed high school algebra. This text's primary goal is to teach the techniques of differential and integral calculus that students are likely to encounter in undergraduate courses in their majors and in subsequent professional activities. The exposition is designed to provide a sound, intuitive understanding of the basic concepts of calculus without sacrificing mathematical accuracy. Thus, the main results are stated carefully and completely, and whenever possible, explanations are intuitive or geometric.