Nanosafety encompasses a spectrum of multidisciplinary studies, including nanotoxicology, immunotoxicology, genotoxicity, and epigenetic effects. Nanomaterials, with their unique properties and diverse applications, have revolutionized industries from medicine to electronics. However, the potential risks associated with their use demand meticulous investigation and understanding. This open access book serves as a crucial resource, bridging the gap between the burgeoning field of nanotechnology and the imperative need to ensure the safety of nanomaterials in various contexts. As nanotechnology continues to transform our world, this book provides invaluable insights and guidance for researchers, policymakers, and industries, ensuring the responsible and safe development of nanomaterials and their applications in the 21st century.