The aim of this book is to give a comprehensive exposition of the foundations of the Standard Model and to outline their applicability to high energy phenomena. It provides an easily accessible introduction to all aspects of renormalization, the mathematical tool that has paved the way for a calculable theory of the fundamental interactions. The book includes all the details needed to derive the results and contains all the relevant formulae, recipes and prescriptions needed to construct the theoretical predictions and compare them with the experimental results. This makes the book unique in its field.