In plain English
A SIEM is the brain of a security monitoring operation. It collects logs from servers, firewalls, endpoints, and cloud services — thousands of events per second — and uses rules and machine learning to find the needles in the haystack that indicate an attack in progress.
Full definition
Every device, application, and service in your environment generates logs. A SIEM collects all of them into one place and runs correlation rules across the data in near real time. A single failed login looks like a typo. A failed login, followed forty seconds later by a successful one from a different country, followed by a 2GB file transfer to an external storage service: that sequence triggers an alert. Without a SIEM, those three events sit in three separate logs that nobody reads.
The platform does not just aggregate. It applies feeds, baseline behaviour analysis, and detection rules tuned to known attack patterns. can ingest signals from , , , and third-party firewall logs simultaneously, then map detections against the MITRE ATT&CK framework so analysts know exactly what stage of an attack they are looking at.
For Australian businesses operating under the , a SIEM is increasingly expected, not optional. The expects organisations to have detection capability. If you cannot show when an incident started and what data was accessed, you cannot meet your reporting obligations or limit your exposure under the Privacy Act. A SIEM provides that audit trail.