Calculus is a branch of mathematics that deals with the study of change. It has two sub-fields namely differential calculus, it is the study of change in slopes and curves, and integral calculus, which is concerned with the study of areas under and between the curves. Both of these branches follow the fundamental theorem of calculus. This book elucidates new techniques and applications of calculus in a multidisciplinary approach. It picks up individual branches and explains their need and contribution in the context of the growth of this field. For all those who are interested in calculus, this textbook can prove to be an essential guide.