What is an observable?

An Observable is a unique Object similar to a Promise that can help manage async code. Observables are not part of the JavaScript language so we need to rely on a popular Observable library called RxJS. The observables are created using new keyword. Let see the simple example of observable,

    import { Observable } from 'rxjs';

    const observable = new Observable(observer => {
      setTimeout(() => {
        observer.next('Hello from a Observable!');
      }, 2000);
    });`