SIEM (Security Information and Event Management) is a platform that aggregates, normalises and correlates log data and security events from across an organisation's IT environment to enable real-time threat detection and forensic investigation. By centralising data from firewalls, servers, endpoints, applications and cloud services, SIEM provides a holistic view of security activity and identifies patterns that individual systems cannot detect in isolation.
A well-tuned SIEM is essential for meeting the logging and monitoring requirements of compliance frameworks such as ISO 27001 and SOC 2. However, the value of a SIEM depends heavily on the quality of its detection rules, the completeness of its data sources and the capacity of the security team to investigate and respond to the alerts it generates. Organisations should invest in ongoing rule tuning to minimise false positives and ensure genuine threats are surfaced promptly.