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What is SIEM? SIEM is the combination of two different types of products, SIM (Security Information Management) that gathers and creates reports from security logs and SEM (Security Event Manager) that uses event correlation and alerting to help with the analysis of security events.
Another important consideration is that the organization must be willing to commit resources to the maintenance, adjusting and evolution of the tool. Event correlation, one of the defining characteristics of a SIEM product, will not turn raw log data into actionable information by itself. Most tools provide a generic set of default correlation rules, conditions or dashboards that in most cases are not the perfect fit for your organization.