Differential calculus is a branch of mathematics that deals with the study of rates of change and slopes of curves. It is a fundamental concept in mathematics, physics, and engineering, and is widely used in various fields such as optimization, physics, and computer science. The book "Differential Calculus" by Das and Mukherjee is a popular textbook that provides an in-depth treatment of differential calculus. This report provides an overview of the book and its contents, with a focus on the PDF version.