In a corporate network setup, the only way to know your cybersecurity stance and whether it has any holes to exploit for potential attackers, would be to test your infrastructure to real attack attempts to determine your system's resilience to threats. With penetration testing, your infrastructure's security holes will be tested against real-world breaching tools and techniques by skilled professionals with experience under their belt to reveal any potential weaknesses. You then get detailed reports about which vulnerabilities were found, how they were exploited, and how you can mitigate the situation to fix the vulnerabilities.