This book describes the basics and historical aspects of thin film. The introductory chapter of this book contains various aspects about thin-film deposition methods, significance of nanomaterials in the fabrication of thin film, certain fundamental characteristics of thin films (electrical, optical, and morphological), some challenges (thickness uniformity, film adhesion issues, temperature-related challenges, film defects and quality control, preparation of the surface of the substrate before deposition, etc.) faced during the formation of thin film, significance, and different types of...