Definition
Monitoring is the continuous observation and measurement of system performance, security status, and operational health. It involves collecting data from various sources, analyzing it for anomalies or trends, and alerting relevant personnel when predefined thresholds are breached or critical events occur. In practice, monitoring systems automatically gather metrics like CPU usage, network traffic, application response times, and security logs to provide real-time insights into system behavior. This proactive approach is crucial for maintaining system availability, identifying potential security threats, and optimizing resource utilization, ultimately preventing costly downtime and performance degradation. For instance, a network administrator might monitor firewall logs for suspicious connection attempts, indicating a potential intrusion attempt. Unlike simple logging, which records events, monitoring actively analyzes these events against established baselines and triggers alerts. This concept is fundamental to domains such as IT Operations, Security Operations, and Cloud Computing, appearing on exams like CompTIA Security+, CySA+, and AWS Certified Solutions Architect Associate.