title: What's the use case of Notification in RxJS?
body: <p>I'm somewhat familiar with basic RxJS concepts like Observables, Observers and Subjects but <a href="https://rxjs.dev/api/index/class/Notification" rel="nofollow noreferrer">RxJS Notifications</a> concept is completely new to me.</p>
  <p>What is it for? When should I use it?</p>