These are some of the common ways to create Observables in RxJS.

What is RxJS?

RxJS is a library for reactive programming using Observables, to make it easier to compose asynchronous or callback-based code.

ItIt provides one core type, the Observable, satellite types (Observer, Schedulers, Subjects) and operators inspired by Array#extras (map, filter, reduce, every, etc) to allow handling asynchronous events as collections. (RxJS Docs).

What is Observable?

Basically, Observable is a lazy Push collection of multiple values. They provide a continuous channel of communication in which multiple values of data can be emitted over time.

Angular widely use Observables like in HTTP service and the event system.

RxJS offers a number of functions that can be used to create observables.

Using of function.
Using from function
Using fromEvent function
Using interval function

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