Learn how connectable observable uses multicasting to share a single source across multiple observers, emitting only after connect(), and delivering values to all observers at once.

Explore how PublishSubject in RxJava RxAndroid emits items only after subscription, risking missed events if created before observers subscribe, and how errors stop emissions for subsequent observers.

explains replay subject in rxjava rxandroid: emits all items to any observer regardless of subscription time, includes time-span variants, and warns about onNext usage to avoid ambiguity.