Of late, both manufacturing and service sector has undergone a rapid changes followed by a series of fundamental developments. Most noteworthy among them is the rapid development and advancement in Information Technology as well as communication system. This has changed the concept of online activities, and has been instrumental behind broadening the dissemination of financial information along with lowering the cost of many financial activities. Information Technology and communication networking systems have revolutionized the functioning of all sectors. Even though the situation prevails, today there is a threat namely crimes through net working and communication devices. One such crime is so called, cyber crime.Cyber crimes are defined, as “acts that are liable to be punished by the Information Technology Act”. There are many cyber crimes, such as email spoofing and cyber defamation, sending threatening emails etc. A simple yet strapping definition of cyber crime would be “unlawful acts wherein the computer is either a tool or a target or both”.KINDS OF CRIMEFinan companies that buy houses cial crimesCyber pornographySale of illegal articlesIntellectual Property crimesCyber stalkingCyber DefamationEmail spoofingSale of illegal articlesCAUSES OF CYBER CRIME:1. AGAINST INDIVIDUALSHarassment via e-mails.Cyber-stalking.Dissemination of obscene material.Defamation.Unauthorized control/access over computer system.Indecent exposure2. AGAINST ORGANISATIONUnauthorized control/access over computer systemPossession of unauthorized information.Cyber terrorism against the government organization.Distribution of pirated software etc. 3. AGAINST SOCIETYPornography (basically child pornography).Polluting the youth through indecent exposure.Trafficking Financial crimesSale of illegal articlesOnline gamblingLEGISLATION COVERED: INFORMTION TECHNOLOGY ACT, 2000Hacking with computer system.(1) Whoever with the intent to cause or knowing that he is likely to cause wrongful loss or damage to the public or any person destroys or deletes or alters any information residing in a computer resource or demises its value or utility or affects it injuriously by any means, commits hack.