Resource usage in cybersecurity refers to the amount of system resources - such as CPU, memory, disk space, or network bandwidth - consumed by an application, process, or service. Monitoring resource usage is essential for detecting unusual patterns that may indicate security threats like malware, denial-of-service attacks, or unauthorized access. High or unexpected resource consumption can degrade system performance, disrupt operations, or signal the presence of malicious activity. Effective resource usage management helps maintain system stability, optimize performance, and enhance security by allowing administrators to identify and address potential vulnerabilities or attacks promptly.