Is RxJS built into Angular?

Yes, RxJS is tightly integrated into Angular and is a core dependency in the Angular framework.

• Angular uses RxJS to handle asynchronous operations like HTTP requests, form changes, and event streams.

• Features such as Observables, operators, Subjects, and BehaviorSubjects are commonly used in services and components.

• Tools like HttpClient, FormControl.valueChanges, and router guards all return observables by default.

RxJS isn’t "built in" to the core Angular compiler, but it’s a required package that powers much of Angular's reactive architecture.