Managed Network Detection and Response (MNDR) is a cybersecurity service that offers real-time monitoring, detection, and response to security threats, managed by third-party providers through Security Operations Centers (SOCs). Key benefits include 24/7 monitoring, real-time threat detection, improved incident response, scalability, and enhanced compliance with industry regulations. However, challenges such as cost, false positives, integration issues, and the need for skilled human expertise must be addressed for effective implementation.