Antimicrobial drug resistance signifies the ability of microorganisms, including bacteria, fungi, viruses, and parasites, to withstand the effects of drugs and medications that were previously effective in treating them. A specific type of antimicrobial resistance, known as multiple drug resistance, occurs when microbes develop resistance to several antimicrobials simultaneously. Various factors contribute to this resistance, such as natural biological processes, inappropriate use of antibiotics, environmental pollution, and inadequate diagnostic practices. All microorganisms have the potential to develop resistance, with notable forms including fungal resistance, antibiotic resistance, antiviral resistance, and antiprotozoal resistance. This book is a valuable compilation of topics, ranging from the basic to the most complex theories and principles in the field of antimicrobial drug resistance. It studies, analyses and upholds the pillars of the subject and its utmost significance in modern times. It will serve as a valuable source of reference for those interested in this field.