This book describes the key cybercrime threats facing individuals, businesses, and organizations in our online world. The author first explains malware and its origins he describes the extensive underground economy and the various attacks that cybercriminals have developed, including malware, spam, and hacking he offers constructive advice on countermeasures for individuals and organizations and he discusses the related topics of cyberespionage, cyberwarfare, hacktivism, and anti-malware organizations, and appropriate roles for the state and the media. The author has worked in the security industry for decades, and he brings a wealth of experience and expertise. In particular he offers insights about the human factor, the people involved on both sides and their styles and motivations. He writes in an accessible, often humorous way about real-world cases in industry, and his collaborations with police and government agencies worldwide, and the text features interviews with leading industry experts. The book is important reading for all professionals engaged with securing information, people, and enterprises. Its also a valuable introduction for the general reader who wants to learn about cybersecurity.