This document provides an introduction to cyber law in India and defines different types of cyber crimes. It categorizes cyber crimes into those where the computer is the target (e.g. hacking, viruses) and those where the computer is used as a weapon to enable real-world crimes (e.g. credit card fraud, IPR violations). Specific cyber crimes discussed include unauthorized access/hacking, Trojan attacks, viruses/worms, email spoofing and spamming, denial of service attacks, and crimes committed over IRC. Technological advancements have enabled new forms of criminal activity through misuse of information technologies.