Essentials of Immunology" serves as a comprehensive textbook for undergraduate and graduate students, offering a thorough exploration of the immune system. Organized into thirteen chapters, the book begins with a historical overview before delving into contemporary advances and applications. Elements, organs, and cells comprising the immune system are described in detail, along with their respective roles in immune function. Topics such as innate and acquired immunity, major histocompatibility complex, antibodies and their subclasses, graft rejection, complement pathways, tolerance, autoimmunity, immune suppression, hypersensitivity, and cytokines are covered extensively. The text is accompanied by well-labeled illustrations to aid understanding, and the language is kept lucid and precise to facilitate comprehension. "Essentials of Immunology" provides a comprehensive resource for students seeking a solid foundation in this vital field of study.