A Security Information Event Management (SIEM) system primarily serves to collect, analyze, and manage data from multiple sources for real-time security monitoring. It aggregates logs and security alerts to detect suspicious activities, thereby enabling organizations to respond to incidents swiftly. Through correlation and analysis, SIEM provides a comprehensive view of the security landscape, aiding in threat detection and compliance reporting. Ultimately, its main purpose is to enhance an organization's security posture by providing actionable insights for risk management and incident response.