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 acalculable theory of the fundamental interactions. The theory is clearly developed from the renormalizability of the Standard Model and guidance is given as to its applications to high energy phenomena. The book includes all the details needed to derive the results and collects in one place allrelevant formulae, recipes and prescriptions which are needed to construct the theoretical predictions and compare them with the experimental results. This makes the book unique in its field.