SIEM vs SOAR: what's the difference?

What SIEM does

Security information and event management ingests logs and events from across your environment — endpoints, servers, firewalls, identity providers, cloud services — normalises them into a common format, and correlates them to find patterns that indicate a threat. Its output is detection: an alert, with the supporting evidence attached. Modern SIEMs add behavioural analytics and threat intelligence enrichment, but the core job remains making sense of a very large volume of events.

What SOAR does

Security orchestration, automation, and response takes over where detection ends. It connects to the tools you already run and executes predefined workflows — playbooks — that would otherwise be manual. Blocking an address, isolating a host, disabling an account, opening and enriching a ticket, gathering context from threat intelligence: each of these becomes an automated step that runs in seconds and identically every time.

The differences that actually matter

Most comparisons list features. In practice the distinction comes down to four things: what triggers the tool, what it produces, who consumes the output, and what it does to your queue.

• Purpose — SIEM detects and investigates; SOAR responds and orchestrates
• Input — SIEM consumes raw logs and events; SOAR consumes alerts and cases
• Output — SIEM produces alerts and evidence; SOAR produces executed actions
• Effect on workload — SIEM tends to add to the analyst queue; SOAR removes from it
• Measured by — SIEM by detection coverage and fidelity; SOAR by mean time to respond

Why SIEM and SOAR integration matters

A SIEM operating alone converts a flood of events into a smaller flood of alerts. That is progress, but every one of those alerts still lands on a person. When SOAR is integrated, a confirmed detection can trigger its containment playbook directly — response time drops from hours to seconds for the classes of incident you have already decided how to handle. The corollary is that integration quality is what you should evaluate: whether events in the SIEM can trigger SOAR actions and vice versa, and whether connectors for your existing tools exist out of the box.

Separate tools or one platform?

You can integrate a standalone SIEM with a standalone SOAR, and plenty of organisations do. The trade-off is integration maintenance — connectors, data mapping, and version drift between two products. Platforms that ship correlation and response together remove that seam, at the cost of some flexibility in choosing best-of-breed for each layer. Which is right depends on whether you have the engineering capacity to own the integration.

Where XDR fits

Extended detection and response overlaps both. XDR typically unifies telemetry across endpoint, network, identity, and cloud with detection and response built in, but scoped to the vendor's own sensors. SIEM remains broader in what it can ingest — including sources no XDR vendor instruments — while SOAR remains broader in what it can orchestrate across third-party tools. The terms are marketed interchangeably, so evaluate on capability rather than category.