A Penetration Tester, or ethical hacker, evaluates an organization's security by simulating cyberattacks to identify vulnerabilities. They conduct assessments, analyze findings, and provide remediation guidance. Key skills include knowledge of security tools, scripting, and networking. Typically, they work in cybersecurity teams, collaborating with system administrators and security analysts. Career progression can lead to roles like Security Consultant or Chief Information Security Officer (CISO), reflecting the growing need for robust cybersecurity measures in organizations.