Simulator
A simulator is a tool or system that imitates the behavior of a real system or environment for development, testing, or training purposes.
“A component or system used during testing which behaves or operates like a given component or system.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Simulator?
Simulators allow software to be tested when actual hardware, devices, or operational environments are unavailable or impractical.
Environment simulation: Mimics real-world behavior.
Cost reduction: Eliminates the need for physical systems.
Early testing: Supports development before hardware is available.
Real World Example
A regulated product team is preparing a release where Simulator appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Simulator as interchangeable with nearby ISTQB terms. That makes test scope blurry and can lead to weak evidence for the release decision.
The tester anchors the discussion in the official definition, asks where the concept appears in the product, and designs examples that show the difference between Simulator and similar ideas.
The page becomes useful in practice because Simulator is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Simulator in the context of ISTQB terminology?
Question 2
A tester needs to explain Simulator to a non‑technical stakeholder. Which approach is MOST appropriate?
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