Cyber crimes are illegal activities that are committed using computers and the internet. Some common types of cyber crimes include hacking, denial of service attacks, virus dissemination, software piracy, pornography, credit card fraud, and phishing. Hacking involves gaining unauthorized access to computer systems or networks, while denial of service attacks flood a victim's bandwidth. Viruses and malware can be used to damage systems. Software piracy involves illegally copying and distributing copyrighted software. Pornography and criminal activities like kidnapping can occur online. Credit card fraud and phishing steal financial information. Precautions like firewalls, strong passwords, and practicing safe online habits can help reduce risks of being targeted by cyber criminals.