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Penetration testing is the process of assessing and evaluating the security posture of computer and network systems by discovering vulnerabilities and attempting to break into these systems. Another term for penetration testing is ethical hacking. Penetration testers are called ethical hackers or white-hat hackers. On the other hand, unethical hackers are called black-hat hackers. The only difference between ethical hacking and unethical hacking is the consent of the target; that is, in ethical hacking, i.e., penetration testing, the target has given written permission to the ethical hacker to perform such test for the purpose of evaluating its security level. Penetration Testing reveals what and how hackers may compromise or damage a certain computer or network system. By conducting a penetration test, the target organization will get to know: The vulnerabilities, or weaknesses, in their systems. How these vulnerabilities may be exploited. The damage – the impact – that may result from such exploitation. How to remediate and eliminate these vulnerabilities.