Hacker

In a security context, a hacker is someone involved in computer security/insecurity, specializing in the discovery of exploits in systems (for exploitation or prevention), or in obtaining or preventing unauthorized access to systems through skills, tactics and detailed knowledge. In the most common general form of this usage, "hacker" refers to a black-hat hacker (a malicious or criminal hacker). There are also ethical hackers (more commonly referred to as white hat), and those more ethically ambiguous (grey hat). To disambiguate the term hacker, often cracker is used instead, referring either to computer security hacker culture as a whole to demarcate it from the academic hacker culture (such as by Eric S. Raymond) or specifically to make a distinction within the computer security context between black-hat hackers and the more ethically positive hackers (commonly known as the white-hat hackers). The context of computer security hacking forms a subculture which is often referred to as... full article at wikipedia