A promise resolves to a single value asynchronously and observable limits to multiple values asynchronously.
Examples:
Promise: Response from an Ajax call
Observable: Click events
An observable allows you to treat streams of asynchronous events with the same sort of simple, composable operations that you use for the collections of data items
A promise is a single value and observable is like a function that can be invoked to produce multiple values. A promise is always cached and multicast whereas an observable is unicast.
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