This book comprehensively explores the pivotal role of phytochemicals in modern drug discovery and biotechnology. It comprises eleven chapters, each offering unique insights into the therapeutic applications, biotechnological advancements, and future prospects of plant-derived compounds. Key topics include the historical use and modern integration of phytochemicals, innovative cultivation and extraction techniques, the synthesis of nanomaterials, and the potential of phytochemicals in combating diseases such as COVID-19. This book also delves into the analytical techniques used for phytochemical analysis, the mineral profiling of medicinal plants, and the interdisciplinary approaches required for successful drug discovery. Furthermore, it addresses the challenges and opportunities in the field, emphasizing sustainable practices, regulatory issues, and the importance of biodiversity conservation. Overall, this book provides a thorough understanding of the multifaceted applications and potential of phytochemicals in contemporary medicine and biotechnology.