Certified Ethical Hacking
A certified ethical hacker is a qualified professional taking care of vulnerabilities and weaknesses in targeted systems and uses analysis data & tools as a malicious hacker, but in a legitimate & lawful manner to assess the security posture of a target systems. Ethical hacker course is a knowledge obtained by assessing the security of computer systems.
Using penetration testing techniques: The penetration tests are employed by organizations that hire certified hackers to penetrate computer and network systems with focus of determining and fixing security vulnerabilities. If the same is done in an unauthorized way then this is referred as Black Hat hacking. Penetration test should be done after the permission from an owner of the targeted systems.