2.Black Hat Hackers:Black hat hackers are hacker with malicious intensions. Kuu They often steal, exploits, and sell data, and are usually motivated by personal gain. Their work is usually illegal. A cracker is like a black hat hacker but is specifically someone who is very skilled and tries via hacking to make profits or to benefits not just to vandalize. Cracker find exploits fir sustem vulnerability and often use them to their advantage by either selling the exploits to other black hat hackers, who is to steal information or gain royalties. 
3.Grey hat Hacker: Grey hat hackers include those who hack for fun or enjoy.They may both fix and exploit vulnerability,but usually not for financial gain.Even if not malicious their work can still be illegal, if done without the target system owner,s consent and grey hats are usually associated with black or crime hackers.
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