SIEM is a tool for integrated management of alerts and event logs output by proxy servers, firewalls, security devices such as IDS/IPS, and endpoint security products such as EDR. By arranging various log formats and collecting statistics, the situation within the organization can be visualized at a glance, and by searching the accumulated logs, it is possible to respond quickly to threats such as cyberattacks.

When a security incident occurs, alerts issued from security devices, etc., are merely a trigger for incident response. Additional analysis of logs from various devices within the organization is performed to analyze the route of intrusion, scope of impact, details of damage, causes, etc. is needed. For this reason, SIEMs are required to properly acquire and store logs so that they can be used at any time.

The volume of logs output by IT equipment on a daily basis is enormous, and it is becoming unrealistic to analyze them manually. A SIEM can take over that work and analyze a larger volume of logs faster. It also helps reduce the time required to respond to incidents and minimize damage.