This document discusses cyber security and threats. It begins with an introduction on the growth of internet in India and the disadvantages of cyber crime. It then defines cyber crime and outlines the history and evolution of cyber threats. The document categorizes cyber crimes and describes various types of cyber crimes like hacking, denial of service attacks, virus dissemination, computer vandalism, and cyber terrorism. It provides safety tips for cyber security and discusses advantages of cyber security in concluding that technology can be destructive if not used responsibly.