what is black hat hackers and …

A white hat hacker is a computer security specialist who breaks into protected systems and networks to test and asses their security. White hat hackers use their skills to improve security by exposing vulnerabilities before malicious hackers (known as black hat hackers) can detect and exploit them. Although the methods used are similar, if not identical, to those employed by malicious hackers, white hat hackers have permission to employ them against the organization that has hired them.

 black hat hacker is a person who attempts to find computer security vulnerabilities and exploit them for personal financial gain or other malicious reasons. This differs from white hat hackers, which are security specialists employed to use hacking methods to find security flaws that black hat hackers may exploit.

Black hat hackers can inflict major damage on both individual computer users and large organizations by stealing personal financial information, compromising the security of major systems, or shutting down or altering the function of websites and networks.

White hat hackers use many of the same tools as a black hat hacker, but they do it for it good. Their work involves penetration testing, evaluating existing security systems, and assessing vulnerability. Most white hat hackers have earned a CEH (Certified Ethical Hacker) designation.