Hacking is an unauthorized access into a system of any kind. By the word any kind, I literally mean any, any kind, be it a digital system or one without even a single digital component. The suitable name for one who breaks into computer's hardware or software is "Cracker", but in general use hacker is the term that has got more attention. Ethical Hacking Hacking made ethical is ethical hacking. The expert computer crackers are called on for deliberate hacking attempt by the authorities of an organization, in order to test their own security level to be aware of their own vulnerabilities. Thus, ethical hacking is hacking a system to know its vulnerabilities by gaining full authority from concerned organization for such an attempt. In today's world of cyber-crime, almost every organization, business need security. The best way to be secured is to think in the way as that of attacker. Thus, ethical hacking is soaring in importance and hence the popularity. Types