This chapter surveys the history and examples of computer crimes, their types, costs to society, and strategies of detection and prevention. In the discussion, it is noted that a great number of computer attacks fall into two categories: penetration and denial of service attacks. And these are discussed in depth. Attack motives are also discussed. Are nations, businesses, and individuals prepared for computer attacks? Are they ready to pay the price? We look for answers to these questions as we ponder the costs and consequences of computer crimes. We note also that although it is difficult to estimate the actual costs of e-attacks on physical system resources, progress is being made for better and more accurate estimates. An in-depth discussion of the social and ethical consequences that include psychological effects, moral decay, loss of privacy, and loss of trust follows. We end the chapter with recommendations for educating the computing device users in computer ethics. The need to educate the user to be aware of possible sources of computer crimes and what to do if and when one becomes a victim of these crimes is stressed. It is noted that education can go a long way in reducing computer crimes if the users take crime preventive steps every time they use the computer and computer-related technologies.