Critical care involves intensive monitoring and treatment of patients in critical condition, typically in Intensive Care Units (ICUs). It requires a multidisciplinary approach, utilizing advanced technology and interventions to support failing organs and sustain life. Emergency medicine deals with the immediate assessment and treatment of acute illnesses and injuries in Emergency Departments (EDs). This specialty emphasizes rapid decision-making, stabilization, and diagnosis to ensure timely intervention. Artificial Intelligence (AI) is revolutionizing critical care and emergency medicine by enhancing diagnostics, treatment, and patient management. AI algorithms analyze vast amounts of data to provide early warnings for conditions like sepsis, respiratory failure, and cardiac arrest, allowing timely interventions. Machine learning models aid in predicting patient deterioration, optimizing triage processes, and personalizing treatment plans. Natural language processing assists in streamlining documentation and improving communication among healthcare providers. Additionally, AI-driven decision support systems offer evidence-based recommendations, reducing diagnostic errors and improving outcomes. This book will also provide interesting topics for research which interested readers can take up. Also included in this book is a detailed explanation of the various concepts and applications of Artificial Intelligence in healthcare. The book is a collective contribution of a renowned group of international experts.