What is ethical hacking

Ethical hacking is a technique of entering into company websites,social networking sites,SQL websites etc., as an administrator.
Basically there are 3 types of hackers

  1.White hats:-
 These are the people who are hired by the companies or organisations to protect themselves from being hacked by hackers. Basically they are good people and don't have any bad ideas and help cyberpolice to track the abused.
2.Black hats:-

   They are the people who make lots of money by hacking into others accounts their main intention is to make money they enter into others mail and transfer money to their accounts.They are highly dangerous than terrorists.
3.Gray hats:-
   They are the people who knows how to hack and they do it for timepass their main scheme is making fun of entering into others accounts.There is no danger with them.

Many of u may arise doubt how is ethical hacking done?
Ethical hacking is the use of programming skills to determine vulnerabilities in a computer system.And to protect us from hacking.
In general words it can be explained as a programmig language as c,c++,etc.