Question

What is the difference between BehaviorSubject and Observable in RxJS?

I’ve been working with RxJS and often come across both BehaviorSubject and Observable. I understand that they are used to manage streams of data, but I’m confused about when to use which. Can someone explain the key differences and their specific use cases?

Answer 1

Feature	Observable	Behaviour Subject
Initial Value	No initial value	Requires an initial value
Memory of Values	Does not store previous values	Remembers and re-emits the latest value to new subscribers
Subscription Behaviour	Emits values on subscription only	Immediately emits the latest value to new subscribers
Use Case	Single-shot events or streams	Shared state, current/latest value to all subscribers