These hackers are the bad guys that operate on the opposite side of the law to White-Hat Hackers. They may or may not have an agenda. In most cases, black-hat hacking and out-right criminal activity are not too far removed from each other. They do not have permission or authorization for their activities; typically their actions fall outside the law.
Black Hats are often individuals with extraordinary computing skills, resorting to malicious or destructive actions and are also referred to as crackers.
Black Hats are often individuals with extraordinary computing skills, resorting to malicious or destructive actions and are also referred to as crackers.