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.

What Is 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.