White hat
A white hat hacker breaks security for non-malicious reasons, perhaps to test their own security system or while working for a security company which makes security software. The term "white hat" in Internet slang refers to an ethical hacker. This classification also includes individuals who perform penetration tests and vulnerability assessments within a contractual agreement.
Black hat
A "black hat" hacker is a hacker who "violates computer security for little reason beyond maliciousness or for personal gain" .Black hat hackers break into secure networks to destroy data or make the network unusable for those who are authorized to use the network.
A white hat hacker breaks security for non-malicious reasons, perhaps to test their own security system or while working for a security company which makes security software. The term "white hat" in Internet slang refers to an ethical hacker. This classification also includes individuals who perform penetration tests and vulnerability assessments within a contractual agreement.
Black hat
A "black hat" hacker is a hacker who "violates computer security for little reason beyond maliciousness or for personal gain" .Black hat hackers break into secure networks to destroy data or make the network unusable for those who are authorized to use the network.
Grey hat
A grey hat hacker is a combination of a Black Hat and a White Hat Hacker. A Grey Hat Hacker may surf the internet and hack into a computer system for the sole purpose of notifying the administrator that their system has been hacked. 
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