Answer
Angular services store shared logic and data. When providedIn: root is used, the service becomes a singleton, shared across the entire application unless scoped locally.
Quick Answer
Angular services provided in root (providedIn: "root") are singletons — one instance per app. Shared state (user info, API results) belongs here. Services provided at component level get a new instance per component tree. Singleton services enable data sharing between unrelated components. Lazy-loaded modules can have their own service instances.
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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