What characterizes academic writing and business writing? What are the differences between the two genres? Where do they intersect? This book offers an overview of the features of both styles of writing, as well as opportunities to improve your writing skills in a wide variety of contexts. This book was written to accompany the free online course of the same name, the second of two courses offered by the College Writing Programs of the University of California, Berkeley, through edX.org. For students in the course, this book offers additional ways to practice writing, editing, and reviewing the materials. However, the materials here are independent of the course, and function as an effective study of academic and business writing.