An addiction is a chronic dysfunction of the brain system concerned with reward, motivation and memory. It involves the way a body craves a substance or behavior, especially if it causes a compulsive or obsessive pursuit of reward and lack of concern over consequences. In contemporary times, smartphone and internet addiction has become a major issue of concern. Smart phone addiction is composed of various basic components. These include obsessive phone use, behaviors such as repetitive checking for messages or updates, or feelings of agitation or suffering without the phone. Internet addiction is a type of addiction that involves the inability to control one's internet use. This condition results in serious impairment of various life functions and can result in a variety of health conditions. This book provides a comprehensive understanding of smartphone and internet addiction. It will serve as a reference to a broad spectrum of readers.