Cyber crime involves unlawful activities using computers and the internet. The document categorizes cyber crimes as those using computers to attack other computers or as tools to enable real-world crimes. It provides examples of various cyber crimes like hacking, child pornography, viruses, and cyber terrorism. It stresses the importance of cyber security to defend against attacks through prevention, detection and response. The document advises safety tips like using antivirus software, firewalls, and strong passwords. India's cyber laws address both traditional crimes committed online and new crimes defined in the Information Technology Act.