We divided hacker into these different groups or categories.

Whitehat 

Blackhat

Greyhat

Script kiddie

Hacktivist

These different terms come from old Spaghetti Westerns, where the bad guy wears a black cowboy hat and the good guy wears a white hat.

White hackers are also called ethical hacker they only use their abilities in good way in other words these hackers are called legal hackers their purpose is only to make internet a safe &secure zone where no onecan hack or harm anyone .Ethical hacker hire by different companies to find and fix vulernabilities.

Blackhat hackers are those hackers who only hacks systems,online organizations,servers data to gain unauthorized access .They are also known as cracker .As blackhat hacking is illegal so we also called them criminals (cyber criminals).

Grey hat hackers are a mixture of both black hat and white hat hackers. When they hack they force companies to pay for them and sometime they skip it & help those companies.

Script kiddie is a new &have  no experience in the field of hacking.They start with little knowledge & sometime it generate horrible results.

A type of hacker who use his skills to anounce a message to government,organizations &different companies.

The famous group anonymous known as hacktivist.