Immunology is the study of immunity or immune system, the system which is involved in the protection of the body from various types of infections. When a foreign substance invades the body, the body evokes various mechanisms to protect itself. To comprehend the subject like immunology, it is essential to study it in its all aspects. This book is a unique approach to understand the fundamentals and emerging trends of immunology in a very simple and self-explanatory form. The book is divided into twenty s covering all important areas of immunology which are essential for proper understanding of the subject. Besides covering fundamental concepts of immunology, there is a separate on Immunotechniques which are commonly used in laboratories. A comprehensive Glossary of important terms has also been included in the book for quick reference.