Negatively, a person skilled in computer programming who uses their abilities to gain unauthorized access to the data in other people’s computers, illicitly copying or destroying data and disrupting computer networks through viruses. “According to this definition a hacker is at best benign, an innocent, who doesn't realize his powers. At worst, he is a terrorist. In the past few years, with the emergence of computer viruses, the hacker has been literally transformed into a virulent force.” (Levy 2010).
Positively, a computer programmer dedicated to finding optimum solutions to programming problems through hands-on experimentation and the sharing of knowledge among peer groups.

Levy, Steven(2010): Hackers.O’Reilly

Chandler, Daniel–Munday, Rod (2011): A Dictionary of Media and Communication. Oxford University Press. Oxford. 181. p. See the Online Edition