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A penetration tester, also known as a pen tester or ethical hacker, is an individual who attempts to identify security weaknesses in computer systems, networks and applications. Penetration testers use various tools to test the strength of these systems’ defenses against malicious attack. The goal of this testing is to determine how well secure the system really is and make sure that no unauthorized access can be done without detection or consequence. Penetration testing involves exploiting vulnerabilities in order to gain privileged information from target computers and/or networks. Pen testers are usually hired by companies and organizations looking for ways to detect security flaws before they become exploited by attackers. They may simulate attacks on physical hardware such as servers or other IT infrastructure components; virtual servers; web applications; mobile devices (including smartphones); cloud-based services like SaaS providers; social media accounts etc., all with different techniques like network scanning, port scans, application fuzzing etc… This allows them discover any exploitable vulnerability which could compromise data confidentiality & integrity within their organization if not addressed quickly & appropriately .Additionally ,they will review logs generated from internal monitoring solutions in order search for anomalies which might indicate presence of malware infections /attacks waiting silently inside corporate environment .Finally ,penetration testers provide detailed reports outlining discovered issues along with recommended steps towards remediation based upon overall risk analysis results due severity level associated each issue found during course evaluation process .