If you've ever locked your front door, set your home alarm, and checked your security cameras before leaving, you've already used the idea behind defense in depth. Instead of relying on just one layer of protection, defense in depth uses multiple security measures to make it much harder for attackers to succeed. If one layer fails, another is there to help stop the threat. In cybersecurity, those layers can include firewalls, multi-factor authentication, antivirus software, encryption, and employee security training. No single tool can stop every attack, but combining several defenses makes a huge difference. I think that's what makes this strategy so effective. It assumes that something might eventually go wrong since no security measure is bullet proof and instead plans for it rather than hoping one security tool can handle everything.
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