This module introduces the dangers of network attacks. It explains that networks and data are attacked for various motivations by threat actors including amateurs, hacktivists, and nation states. The module discusses examples of hijacked individuals through evil twin attacks, ransomed companies targeted by ransomware, and nation states targeted by sophisticated malware like Stuxnet. It also explains the potential impacts of attacks including theft of personally identifiable information, loss of competitive advantage through stolen intellectual property, and political disruption through attacks on infrastructure.