Answer
Component-level services create a new instance for each component instance.
Module-level services provide a shared instance across the entire module/application.
Quick Answer
Component-level providers (in @Component providers[]) create a new service instance per component - not shared. Module-level providers (in @NgModule providers[]) are shared across all components in that module. Root-level (providedIn: "root") creates one singleton shared app-wide. Choose based on sharing needs: root for app-wide singletons, component for isolated instances (like form validation state).
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ