You can think of an observable as an array whose items arrive asynchronously over time. Observables help you manage asynchronous data,
such as data coming from a backend service. Observables are used within
Angular itself, including Angular’s event system and its http client
service. To use observables, Angular uses a third-party library called
Reactive Extensions (RxJS). Observables are a proposed feature for ES 2016, the next version of JavaScript.
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