PromisesObservables
Promise helps us to run the functions asynchronously, and use their return values or exceptions but only once when executedObservables helps us to run the functions asynchronously, and use their return values in a continuous sequence (multiple times) when executed.
Not LazyBy default Observables are Lazy as it emits values when time in progresses.
Not cancellable. The two possible decisions are: Reject
and Resolve
Can be canceled by using the unsubscribe() method
Emits only a single value at a timeEmits multiple values over a period of time
Calls the services without .then and .catchIs not called until we subscribe to the Observable

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