This book highlights the applications of nanotechnology in modern medicine. Today we are living in a world of fast-changing behavior and lifestyles. Despite health and wellbeing are often pronounced and enforced, the diseases and illnesses are emerging in different forms, at an alarming rate. Protecting the mankind is becoming ever more challenging. In this backdrop, medicine needs new approaches and technologies to build the defenses. Nanotechnology is successfully confronting the situation. It does so in two avenues, namely, nanomaterials, and, nanodevices. Nanomaterials possess extraordinary properties that are utilized to confront bacteria and viruses, and for targeted drug delivery. Nanodevices can be maneuvered inside the human body to reach extreme locations. This book presents the latest developments in these areas.