Cyber warfare is an emerging reality that involves attacks in cyberspace to disrupt digital systems and infrastructure. Nation states and other groups now use cyber attacks for purposes like espionage, sabotage, and warfare. The document discusses the history and evolution of cyber warfare, from early hacker attacks to modern incidents like Stuxnet. It outlines the threats in cyberspace, from individual hackers to nation states. Various cyber weapons, tactics, and operations are also described. While increased cyber security could help, deterrence and international agreements may be needed to reduce cyber conflicts between nations in the future.