White-hat hackers are the opposite of the black-hat hackers.They’re experts in compromising computer security systems who use their abilities for good, ethical, and legal purposes rather than bad, unethical, and criminal purposes.
Black-hat hackers violate computer security for personal gain(such as stealing credit card numbers or harvesting personal data for sale to identity thieves) or for pure maliciousness.
A gray-hat hacker falls somewhere between a black hat and a white hat.A gray hat doesn’t work for their own personal gain or to cause carnage, but they may technically commit crimes and do arguably unethical things.