Addiction refers to a neuropsychological disorder characterized by continued substance abuse or engaging in certain behaviors despite being aware of the associated negative outcomes. Repetitive drug usage affects brain function in ways that prolongs yearning and decreases self-control. Experts have identified two major types of addictions, namely, chemical addiction and behavioral addiction. Addiction to substances such as nicotine, alcohol, amphetamine, and cocaine are examples of chemical addiction. On the other hand, behavioral addictions comprise behaviors such as sex, video games, gambling, and binge eating. Addictions are treatable disorders. The first step involved in treating any addiction and ensuring long-term recovery is assessment of addiction. Patients must first undergo a thorough assessment at an addiction treatment center before the experts can devise an effective treatment plan. De-addiction treatment plans usually recommend the use of one or more therapies such as rational emotive behavior therapy, contingency management, cognitive behavioral therapy, medication-assisted treatment, and detoxification. This book is compiled in such a manner, that it will provide in-depth knowledge about the epidemiology, assessment, and treatment of addictions. It will help new researchers by foregrounding their knowledge in this area of study.