This book educates, informs, and empowers the readers about the impact of toxic substances on living organisms and the environment by comprehensively exploring their effects. From its engaging introduction to the core concepts of toxicology to its detailed exploration of key principles, the book takes readers on an enlightening journey through the field. It explains the basic concepts of toxicity and how various toxins interact with biological systems and disrupt normal physiological processes. It throws light on improving safety and regulatory measures and raises awareness about potential toxic hazards. Furthermore, it addresses the impact of specific classes of contaminants, such as heavy metals, pesticides, endocrine disruptors, and emerging pollutants. It is a valuable resource for students, researchers, and anyone curious about the impact of chemicals on human health and the environment because it bridges the gap between scientific jargon and layman's terms.