Problem Statement
Explain what is meant by Defense in Depth and why organisations use it.
Explanation
Defense in Depth refers to implementing multiple layers of security controls so that if one control fails, others still protect the system. Imagine a castle: moat, walls, guards, lookouts — if one fails, the next layer still defends. Organisations use this because no single control is perfect. For example, combining firewalls, intrusion detection systems, encryption, access controls, and security-aware users means many small failures won’t result in a breach. It emphasises resilience, redundancy, and the idea that security is not just one thing, but a set of overlapping protections.
