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A term broadly used to describe hardware and software research and development, and modification. "To hack" essentially means "to plow," and refers to assembling and modifying computer systems and programs. Programmers with high technical capabilities are given the honorary title of hacker.
The word can also refer to invading another person's computer, but the correct term is "cracking." Programmers who are adept at cracking refer to themselves as hackers. As a result, hacking is often taken to mean a criminal act.
Person 1 : Hi, I'm a hacker!
Person 2 : OMG WTF U STEAL PPLS BANK ACCOUNTZZ???
Person 1 : No you moron, that would be a cracker.
by linuxroxxx August 27, 2011
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They see what a normal user cannot see,
They can do what a normal user cannot,
they have no leaders, no real friends,
they are...

gods of the interwebs!
hackers are so cool, I want to be one!
by iAmQ January 08, 2010
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A hacker is a very skilled Computer Expert. Those who use this talent for evil are known as crackers (Computer Term)
We Hackers are here to learn about computers for good, But those crackers give us a bad name.
by InternetGeek96 January 23, 2010
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There are three forms of hacker. There is White Hat Hacker, a Black Hat Hacker and a grey hat hacker.

A white hat hacker will often be someone who is working for a company to find exploits and security issues with the companies system. Any security issues will be passed on by the hacker to the person responsible for managing the system. A white hat hacker can also be someone who is hacking just for fun and a challenge without causing any damage or doing any malicious acts. They may even contact the person they have hacked to tell them about these security issues they have found.

A black hat hacker is almost definatly a person who is hacking with further intent of criminal acts. They will deface websites, steal data and perform many other malicious activities involving the data and information they have received via hacking.

A grey hat hacker is generally someone who performs a bit of both. They ofter do not perform extremely bad acts and may just deface a website rather than steal data and information such as credit card details, etc.

The motive behind hacking can often be more mischievous than sinister. For example: Someone may hack just to prove that they can.
Example invovling white hat hacker
Someone: "This is the most secure system we have to date, hard for any hacker to hack."
Hacker: "I'm sure i can find something wrong with it."
Someone: "Theres no chance."
Hacker: "Okay, i'll proove it."
Hacker: *Goes of and hacks the system*
Hacker: "Told you it is probably possible."
Someone: "What security issue did you manage to find?"
Hacker: "Well this is what i found..."
by a n o n y m o u s October 24, 2005
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Pretty much what 10 year olds scream if you do better than them in a video game
He got a triple kill? That's impossible! HACKER I WILL REPORT YOU!
by Tommy010 March 15, 2015
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Humans, who usually have alot of acne and glasses, who are shunned by society and want to get back at them by wreaking peoples computers.
The loser who wants your girl and decides to get back at you by messing up your computer.
by The Real Napster April 12, 2005
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1)Magic people, voodoo people!
2)The voodoo, who do, what you don't dare do people.
1)Get those hackers out of our mainframe!
2)The magic people, voodoo people hacked into my system and trashed it!
by ChaosBlizzard September 19, 2005
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