The book contains four parts. If you require only a brief overview over the neuroscientific literature as a starting point, the summary in Chap. 12 will be of help. Chapters 3–11 deal with distinct perspectives such as structural brain imaging and Internet addiction. If you are mainly interested in therapeutic interventions in the context of Internet addiction, you can skip the second part of the book (perhaps with the exception of Chap. 6 dealing with functional changes of the brain related to the treatment of Internet Gaming Disorder) and immediately go to the third part, which provides different perspectives on the treatment of Internet addiction. The fourth part of the present book is an extension to the first edition and deals with a new emerging potential disorder related to Internet addiction—smartphone addiction. Finally, the book closes with an Appendix called Neuroanatomy comprising several figures on human brain anatomy, intended to accompany the chapters of the second part. In addition, a short glossary explains key vocabulary from the book.