certified ethical hacker.

An ethical hacker are usually peoples employed by an organization who trusts him or her to attempt to penetrate networks or computer systems, using the same methods as a hacker would deploy for hacking into networks or computer systems. The purpose of a n ethical hacker is of finding and fixing computer security vulnerabilities and preventing the hack .

Illegal hacking (i.e., gaining unauthorized access to computer systems) is a crime in most countries, but penetration testing done by request of the owner of the targeted systems or networks is not considered as a crime infact ethical hackers are paid for it.

A Certified Ethical Hacker are those people who have obtained a certification in how to look for the weaknesses and vulnerabilities in target systems and uses the same knowledge and tools as a hacker would use.

The EC-Council 's Certified Ethical Hacker (C|EH) is a professional certification in the field of ethical hacking. C|EH is just a starting step in Information security field.