This document discusses different types of computer criminals and their motivations. It describes computer criminals as either hackers, crackers, cybercriminals using computers as tools, or cybercriminals targeting computers. Hackers may be motivated by technical challenge, curiosity or fame, while crackers are primarily motivated by malicious intent such as destroying data. Cybercriminals may use computers to facilitate traditional crimes like fraud, theft or communication crimes. Those targeting computers include virus creators and the Unabomber. The document also notes differences between novice criminals, deranged individuals, organized crime groups, and career criminals in their online activities.