This document discusses various types of cyber crimes and how they are committed. It begins by defining cyber crimes as offenses committed using modern telecommunications networks like the internet to intentionally harm a victim's reputation or cause harm. The document then categorizes cyber crimes as those directly targeting computers/devices, or using computer networks to enable other crimes. Specific crimes discussed include computer viruses, denial of service attacks, identity theft, hacking, spam, and wireless network hijacking. The document also covers investigating cyber crimes through computer forensics and challenges law enforcement faces in dealing with these new types of crimes.