Terrorists fight their wars in cyberspace as well as on the ground. However, while politicians and the media have hotly debated the dangers that cyberterrorism poses to the Internet, surprisingly little is known about the threat posed by terrorists’ use of the Internet. Today, as this report makes plain, terrorist organizations and their supporters maintain hundreds of websites, exploiting the unregulated, anonymous, and easily accessible nature of the Internet to target an array of messages to a variety of audiences. Gabriel Weimann identifies no fewer than eight different ways in which terrorists are using the Internet to advance their cause, ranging from psychological warfare to recruitment, networking to fundraising. In each case, the report not only analyzes how the Internet can facilitate terrorist operations but also illustrates the point with examples culled from an extensive exploration of the World Wide Web.