SIEM and SOAR are two of the most commonly confused acronyms in security operations. They are related, often work together, and many vendors bundle them — but they solve fundamentally different problems.
A SIEM (Security Information and Event Management) is about detection — it collects and correlates logs to identify threats. A SOAR (Security Orchestration, Automation and Response) is about response — it automates the actions taken after a threat is detected. SIEM tells you something is wrong; SOAR does something about it automatically.
The simplest way to remember it
SIEM = the smoke detector. SOAR = the automatic sprinkler that turns on when the alarm fires. You need the detector first; the sprinklers only help if something reliable tells them when to activate.
A SIEM ingests log data from across your infrastructure, normalises it, and runs correlation rules to detect threats. Its outputs are alerts, dashboards, and compliance reports. For a full breakdown, see what a SIEM is. It is the detection and visibility layer of security operations.
A SOAR platform sits downstream of detection. When an alert fires, SOAR executes a playbook — a predefined automated response. For example, when a SIEM detects a compromised endpoint, a SOAR playbook might automatically isolate the host, disable the affected account, create an incident ticket, and notify the on-call responder — all within seconds. Its three capabilities are orchestration (coordinating across tools), automation (executing repetitive tasks), and response (running structured playbooks).
The line has blurred. Modern SIEM platforms increasingly include built-in automation and response — alert enrichment, basic playbooks, one-click actions. For many organisations, a capable SIEM with response features eliminates the need for a separate SOAR entirely. nPro takes this integrated approach: detection, correlation, alerting, and a built-in response engine in one platform.
You always need a SIEM — it is the foundation; without detection there is nothing for SOAR to respond to. You might need a dedicated SOAR if you run a mature SOC processing thousands of alerts daily, operate a complex multi-tool stack needing deep orchestration, and have engineering resources to build and maintain playbooks. You probably do not need one if your SIEM already covers your response automation and your alert volume is manageable.
The common mistake
Many organisations buy SOAR before their SIEM detection is mature. This is backwards — automating response to low-quality alerts just automates noise. Get detection right first, then consider whether automation is the next bottleneck.
nPro combines SIEM detection with built-in response automation. Self-hosted, full data sovereignty.
Related: What is a SIEM? · Detecting Ransomware · nPro SIEM