Chapter 1 introduces the concept of cybercime. It begins by tracking the history of the computer and information communication technologies, showing how we have moved from physical computers to cloud-based systems. It shows how criminals have exploited technology throughout time and questions whether there is anything truly called cybercrime. It introduces the Dark Web (and notes that this has legitimate purposes too) and also the use of Artificial Intelligence. It then turns to definitions of cybercrime and considers how you can classify cybercrime. This includes computer-assisted crimes and computer-focused crimes and focuses on whether the crime takes place wholly in the physical world, wholly in the online world or both. The chapter also considers some of the problems of cybercrime, including its scale, the fact that people can be anonymous and that it has a global reach. The chapter concludes by looking at the Budapest Convention, also known as the Cybercrime Convention, and how this has become the key international instrument. It notes that a new United Nations Convention is being drafted but that it is unlikely to surpass the Budapest Convention.