This document discusses hackers and computer viruses. It defines hackers as people who create viruses and software to destroy other computers' files. It notes that hackers usually control viruses to hack computers, and some viruses can cause errors. The document recommends using antivirus software and firewalls, and avoiding excessive internet use and chatting with strangers to prevent hacker attacks. It also characterizes hackers as criminals who hack for money or terrorism and notes that hackers may end up in jail.