________ is a security strategy in which several protection layers are placed throughout an information system.

The term "Defense-in-depth" refers to a comprehensive security strategy that implements multiple layers of protection throughout an information system. This approach enhances security by ensuring that if one layer is breached, additional layers remain in place to prevent unauthorized access or mitigate potential damage.

In practice, Defense-in-depth involves the use of various security measures, such as firewalls, intrusion detection systems, antivirus software, and user training, each serving a unique purpose in safeguarding the system. By creating these overlapping layers, organizations can better manage risk and respond to threats more effectively.

This strategy contrasts sharply with more singular approaches to security, which often focus on one specific layer or type of defense. These could leave systems vulnerable if that single layer fails. Defense-in-depth, however, provides resilience and a more robust security posture, making it a preferred method in cybersecurity.