As antibiotic resistance escalates, phage therapy is re-emerging as a precise and adaptable alternative to conventional treatments. This book presents a comprehensive exploration of bacteriophages--viruses that infect and destroy bacteria--and their therapeutic potential in modern medicine. It covers key aspects of phage biology, design, and delivery, including advanced strategies that combine phages with antibiotics, immunotherapy, and photodynamic approaches. The text also addresses production standards, safety protocols, and regulatory frameworks essential for clinical translation. Drawing on global case studies and recent clinical trials, the book illustrates both the promise and complexity of deploying phage therapy against resistant infections. Future-facing chapters explore personalized phage medicine, AI-driven phage selection, and integration into broader antimicrobial strategies. Written for researchers, clinicians, and graduate students in microbiology, pharmacology, and biomedical sciences, this volume bridges foundational science with translational insight. It is a timely and authoritative resource for those advancing targeted solutions in the fight against superbugs.