Some of the Angular features, such as Http, automatically create and return Observables. But in some cases, you may want to create your own Observables.
Create your own Observable using a creation function.
A creation function is an RxJS library function that takes in arguments and returns an Observable.
You can create an Observable from a set, an array, a timer, keyboard events, mouse events, and much more.
This series covers the more common creation functions.