This book is helpful to both undergraduate and postgraduate students through effective formulation of graphical illustrations of Divisor Cayley Graphs. It develops a thorough understanding of the structure of these graphs. Dominating Functions is one of the interesting topic of Graph Theory. In this text theory of dominating functions in Divisor Cayley Graphs is introduced. Also the concept of convex combination of dominating functions with explanation and neat free-body diagrams are presented. Some particular cases have been mentioned in the book and at the end a number of references have been included. In addition, the results and discussions designed to aid further understanding of the subject.This book will also be beneficial for researchers and useful for beginners who want to do research in these topics.