The principles as well as applications of Atomic Absorption Spectroscopy (AAS) are elucidated in this book. Atomic absorption spectroscopy is one of the methods of analyzing qualitative and quantitative components in numerous fields like biomaterials, forensic science and industrial residues. The objective of this book is to encompass crucial spheres needed for helping scholars to comprehend current developments in this sphere. The book emphasizes on particular spheres in certain cases. It talks about history, basic principles, instrumentation and sample preparation, in-depth analysis with discussions on elemental profiling, functions, biochemistry and potential toxicity of metals, along with comparative techniques. This book also overviews the importance of sample preparation methods with emphasis on other details. Parts of the book also focus on ways to differentiate the components. The intervention results between various components have also been elucidated. This book will prove to be useful to everyone working in the related fields of AAS.