Answer
A Subject is both an observable and an observer. Angular uses it for shared service communication, event broadcasting, and maintaining UI state.
Quick Answer
Subject is both an Observable and Observer - you can call next() to emit values and subscribe() to receive them. In Angular services, use Subject for event buses: private events$ = new Subject(); expose as Observable: asObservable(). Multiple components subscribe to share the same event stream. Unlike BehaviorSubject, Subject doesn't replay last value to new subscribers.
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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