What is Defense-in-Depth? What is In-Depth-Security?

ISO62443 in-depth-security defense-in-depth layering
cybersecurity
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Table of Contents

ISO 62443

I found the best definition to be from ISO/IEC 62443:

The application of multiple countermeasures in a layered or stepwise manner to achieve security objectives. The methodology involves layering heterogeneous security technologies in the common attack vectors to ensure that attacks missed by one technology are caught by another.

Defense in Depth aka In-Depth-Security