A penetration test, often called a 'pen test', is a simulated cyberattack performed by cybersecurity professionals to identify vulnerabilities in computer systems, networks, or applications. The goal is to find and fix security weaknesses before malicious hackers can exploit them. During a penetration test, experts use various tools and techniques to mimic real-world attacks, helping organizations understand their security risks and improve their defenses. This proactive approach is a key part of maintaining strong cybersecurity.