In the field of particle and astrophysics one of the major unresolved problems is to understand the nature and properties of dark matter, which constitutes almost 80% of the matter content of the universe. This book gives a pedagogical introduction to the field of dark matter in general, and in particular to the model building perspective. Starting from the evidence and need for dark matter, it goes into the deeper understanding of how to accommodate a dark matter candidate in a particle physics model. This book focuses on teaching the basic tools for model building of dark matter, starting from the easiest and gradually progressing to the most difficult. Although there are plenty of dark matter models available, this book concentrates on the important ones. It aims to motivate the reader to propose a new dark matter model complying with all observational constraints.