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Endpoint Detection and Response (EDR) primarily involves continuous monitoring and response to threats on endpoint devices. EDR solutions are designed to identify suspicious activities and potential security breaches on endpoints, such as laptops, desktops, and mobile devices. These tools collect and analyze data from endpoint systems, enabling organizations to detect threats in real time, investigate security incidents, and respond to them effectively.

This continuous monitoring aspect is crucial as it allows security teams to maintain awareness of endpoint security status and quickly address any threats that may arise. By leveraging advanced analytics and automated response capabilities, EDR technologies enhance an organization's security posture by proactively identifying and mitigating potential attacks before they can escalate.

The other options do not encompass the core functionality of EDR. Periodic user access reviews focus on ensuring that users have appropriate access rights, which is distinct from the ongoing threat detection that EDR provides. Regular audits of network infrastructure are related to overall security practices but do not specifically address the continuous monitoring of endpoint threats. Lastly, while creating detailed incident response plans is vital for preparing to handle security events, it does not directly represent the real-time monitoring and threat response capabilities that define EDR systems.