What is the term Hacker mean's?

HACKER:-
In common usage, a hacker is a person who breaks into computers, usually by gaining access to administrative controls.
The subculture that has evolved around hackers is often referred to as the computer underground. Proponents claim to be motivated by artistic and political ends, and are often unconcerned about the use of illegal means to achieve them.
Other uses of the word hacker exist that are not related to computer security (computer programmer and home computer hobbyists), but these are rarely used by the mainstream media.
Hacking developed alongside "Phone Phreaking", a term referred to exploration of the phone network without authorization, and there has often been overlap between both technology and participants. Bruce Sterling traces part of the roots of the computer underground to the Yippies, a 1960s counterculture movement which published the Technological Assistance Program (TAP) newsletter. [3]. Other sources of early 70s hacker culture can be traced towards more beneficial forms of hacking, including MIT labs or the homebrew club, which later resulted in such things as early personal computers or the open source movement.
Hacker groups:-
The computer underground is supported by regular real-world gatherings called hacker conventions or "hacker cons". These have drawn more people every year including SummerCon (Summer), DEF CON, HoHoCon (Christmas), and H.O.P.E..[citation needed] They have helped expand the definition and solidify the importance of the computer underground.
Hacker attitudes:-
Several subgroups of the computer underground with different attitudes and aims use different terms to demarcate themselves from each other, or try to exclude some specific group with which they do not agree. Eric S. Raymond advocates that members of the computer underground should be called crackers. Yet, those people see themselves as hackers and even try to include the views of Raymond in what they see as one wider hacker culture, a view harshly rejected by Raymond himself. Instead of a hacker – cracker dichotomy, they give more emphasis to a spectrum of different categories, such as white hat (ethical hacking), grey hat, black hat and script kiddie. In contrast to Raymond, they usually reserve the term cracker to refer to black hat hackers, or more generally hackers with unlawful intentions.