Can you explain the concept of defense in depth and how you would apply it to a company's cybersecurity strategy?

``` Defense in depth is a layered security approach that mitigates risks by implementing multiple controls and protections at different layers of the IT infrastructure. For instance, I would apply this at a company by ensuring secure gateways, intrusion detection systems, endpoint security, and regular employee training. Each layer provides specific protections, ensuring that if one layer fails, others remain to defend against breaches. ```