Who is a hacker? If you think a hacker is someone who is breaking into systems to stole,destroy or modify something, then you must read this post.
Unfortunately, many people have been fooled into using the word 'hacker' instead of crackers. Crackers are the people who breaks into computers with malicious or criminal intentions or recovers encrypted passwords from data that has been stored in or transmitted by a computer system or associated to accounts.
Hackers are entirely opposite to crackers in terms of their intention. A community of enthusiast computer programmers and systems designers, originated in the 1960s around the Massachusetts Institute of Technology's (MIT's) Tech Model Railroad Club (TMRC) and MIT Artificial Intelligence Laboratory. The members of this culture originated the term hacker. This community is notable for launching the free software movement. The World Wide Web and the Internet itself are also hacker artifacts.
The basic difference is: hackers build things, crackers break them. Hackers solve problems and build things, and they believe in freedom and voluntary mutual help.