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What is the difference between StaticResource and DynamicResource?

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StaticResource resolves the resource once at load time—efficient but won't reflect later changes. DynamicResource keeps a live link, updating the target if the resource is replaced (e.g., swapping a theme dictionary at runtime). Use DynamicResource only where runtime changes are needed, since it has slight overhead.
<!-- Updates live if 'Primary' is swapped at runtime -->
<Button BackgroundColor="{DynamicResource Primary}" />
Real-world example Theme colors use DynamicResource so switching light/dark at runtime recolors the UI instantly, while static values use StaticResource.

Common follow-ups: When must you use DynamicResource? | What's the performance trade-off?

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