This document discusses threats, attacks, and vulnerabilities which play a key role in cyber security. It begins by defining cyber security as preventing, detecting, and responding to cyber attacks. It then discusses various common cyber threats like cyber theft, cyber vandalism, and denial of service attacks. It also examines different types of cyber attacks like untargeted and targeted attacks. The document outlines how vulnerabilities in software, policies, users, and other areas can enable these threats and attacks. It concludes that while technology can help reduce cyber attacks, vulnerabilities ultimately reside with human behavior, so education is important to strengthen cyber security.