The development of the Internet and related communication technologies has had a transformative effect upon social, political, economic, and cultural life. It has also facilitated the emergence of a wide range of crimes that take shape in the spaces of virtual communication. These offenses include technology-oriented crimes such as hacking and the distribution of malicious software; property-oriented crimes such as media piracy, theft, and fraud; and interpersonal offenses such as stalking, harassment, and sexual abuse. In many instances, these crimes serve to entrench and exacerbate existing patterns of victimization, vulnerability, and inequality, along lines of difference related to gender, sexuality, ethnicity, age, and income. The anonymized and globally distributed nature of the Internet creates huge challenges for crime prevention, detection, and prosecution of online offenses.