An ethical hacker is a computer security expert who uses his or her skills in a legal and authorised manner to test and improve the security of computer systems.
It is often referred to as a pentester because it makes pentests.
An ethical hacker is a "white hat" hacker, as opposed to a "black hat" hacker, who has malicious intentions.
They sometimes work within an organisation in a particular field. Red Team or a Blue Team.
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