The Four Types of Error Monitoring are Systems Monitoring, Log Management, Application Performance Management (APM) Monitoring, and Error/Crash Monitoring. These types of monitoring serve different purposes and target distinct audiences, including system administrators, operations teams, developers, and customers. Each type has its own set of tools, use cases, and intended audiences, and they often overlap or complement each other in various ways. Systems monitoring involves checking data center equipment and resource consumption, log management aggregates and searches logs for events, APM displays application behavior and performance metrics, and error/crash monitoring surfaces runtime errors and crashes within applications, providing context and information to developers for fixing issues.