Hackers are individuals with thorough knowledge of computer systems and networks who find loopholes to gain unauthorized access. White Hat hackers are ethical hackers with good intentions. They are security experts hired by organizations to identify and fix security flaws in systems, effectively working against black hats.

Black Hat hackers, also known as crackers, use their knowledge unethically. They break the law and disrupt security by exploiting flaws and loopholes in a system for malicious purposes.

Grey Hat hackers represent a neutral category between white and black hats. They hack systems by exploiting vulnerabilities but do not seek monetary or political gains. Instead, they take system security as a challenge and hack systems simply for the fun of it.