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cold vs hot
Observables observe and they can be observing before they are subscribed to. A hot observable is when the observable is emitting datg prior to the subscription and the subscription shows only teh emitted valuse at the time the subscription starts. A cold observable does not start emitting valuse until it is subscribed to.
Simple - not quite becasue there is a grey zone and RxJS provides methods to retrieve earlier emitted values from a hot observable. So there are warm Observables. The operators public, connect and refCount which permits the definition of warm Observalbles. Please see the reference for details