Hacking and cracking are amongst the gravest Cybercrimes known till date. It is a dreadful feeling to know that a stranger has broken into your computer systems without your knowledge and consent and has tampered with precious confidential data and information. Coupled with this , the actuality is that no computer system in the world is hacking proof. It is unanimously agreed that any and every system in the world can be hacked. The recent denial of service attacks seen over the popular commercial sites like E-bay, Yahoo, Amazon and others are a new category of Cybercrimes which are slowly emerging as being extremely dangerous. Using one’s own programming abilities as also various programmes with malicious intent to gain unauthorized access to a computer or network are very serious crimes. Similarly, the creation and dissemination of harmful computer programs or virus which do irreparable damage to computer systems is another kind of Cybercrime. Software piracy is also another distinct kind of Cybercrime which is perpetuated by many people online who distribute illegal and unauthorised pirated copies of software.