This document discusses cyber security and provides information on various cyber threats such as viruses, hackers, malware, Trojan horses, and password cracking. It defines cyber security as protecting online information and explains the need for cyber security as more people go online. The document outlines common security threats and their solutions, such as installing antivirus software to prevent viruses and worms, using strong and unique passwords to prevent hacking and cracking, and activating firewall and antivirus protection to stop malware and Trojan horses. It emphasizes that cyber security is a shared responsibility and outlines simple prevention methods to protect computers from infection.