Script Kiddie

A person, normally someone who is not technologically sophisticated, who randomly seeks out a specific weakness over the Internet in order to gain root access to a system without really understanding what it is s/he is exploiting because the weakness was discovered by someone else. A script kiddie is not looking to target specific information or a specific company but rather uses knowledge of a vulnerability to scan the entire Internet for a victim that possesses that vulnerability.

Grey hats

A grey hat, in the hacking community, refers to a skilled hacker whose activities fall somewhere between white and black hat hackers on a variety of spectra. It may relate to whether they sometimes arguably act illegally, though in good will, or to show how they disclose vulnerabilities. They usually do not hack for personal gain or have malicious intentions, but may be prepared to technically commit crimes during the course of their technological exploits in order to achieve better security. Whereas white hat hackers will tend to advise companies of security exploits quietly, grey hat hackers are prone to "advise the hacker community as well as the vendors and then watch the fallout".

White Hats

The term "white hat" in Internet slang refers to an ethical hacker, or a computer security expert, who specializes in penetration testing and in other testing methodologies to ensure the security of an organization's information systems.^[1] Ethical hacking is a term coined by IBM meant to imply a broader category than just penetration testing.White-hat hackers are also called "sneakers", red teams, or tiger teams.An explanation in simpler more understandable terms, is a hacker, who is hacking for the purpose of improving internet security.

Top 12 White Hat Hackers :- http://www.networkworld.com/slideshows/2010/041510-white-hat-hackers.html

Black Hats

A Black Hat Hacker is a hacker who "violates computer security for little reason beyond maliciousness or for personal gain". Black Hat Hackers form the stereotypical, illegal hacking groups often portrayed in popular culture, and are "the epitome of all that the public fears in a computer criminal". Black Hat Hackers break into secure networks to destroy data or make the network unusable for those who are authorized to use the network. They choose their targets using a two-pronged process known as the "pre-hacking stage."
These people are cyber criminals and do most of the illegal things going on the internet..

Top 10 Black-hat hackers :-http://www.focus.com/fyi/top-10-most-famous-hackers-all-time/

HACKER !!! ?????

An Hacker is an individual with some very good knowledge about the  compuer's Software and Hardware.

These people breakdown the security with there exceptional knowledge. There main intention is to do illegal things..

Most hackers do it for fun and to hang around ..