The hackers' "Jargon File", compiled collectively on the Net, defines them as people who "program enthusiastically" and who believe that "information-sharing is a powerful positive good, and that it is an ethical duty of hackers to share their expertise by writing free software and

The introvert/extrovert divide is the most fundamental dimension of personality. Psychologist Carl Jung was the first to popularize the terms introverts and extroverts as the central building blocks of personality. Introverts are drawn to the inner world of thoughts and feelings, and extroverts to the external life of people