A Zero-Day Attack is a cyberattack that exploits previously unknown vulnerabilities in software, hardware, or networks before developers release patches or security updates to mitigate risks. Mitigating zero-day attacks requires entrepreneurs to implement proactive cybersecurity measures, monitor threat landscapes, and adopt defense-in-depth strategies that prioritize risk management, incident response preparedness, and cybersecurity resilience to protect sensitive data, safeguard business operations, and maintain trust with stakeholders in digital ecosystems.