SIEM (Security Information and Event Management) is a central system that aggregates security events from multiple sources — firewalls, endpoints, applications, cloud, identity — correlates them, applies detection rules, and alerts on suspicious patterns the individual tools would not see in isolation. It is the operational heart of a Security Operations Center (SOC).
A classic example: the firewall logs a suspicious external connection from a corporate endpoint; the EDR on that same endpoint logs the execution of an anomalous process; identity logs a successful out-of-hours login. Each event in isolation may go unnoticed; correlated by the SIEM, they paint a clear picture of an intrusion in progress. The difference is between discovering an incident with the attacker's screen recording and discovering it three weeks later with the report of the customer whose data was sold.
INFOS implements SIEM for customers with SOC maturity requirements — typically in regulated sectors (financial, health), companies with NIS2/DORA applicable, or organisations with critical IP. The implementation is always accompanied by process (who responds to the alerts, in what window, with what escalation) — a SIEM without process is guaranteed alert fatigue.