# Observables and operators

​The previous sections of this guide referred to RxJS `Observables` and operators such as `catchError` and `retry`. You will encounter more RxJS artifacts as you continue below.

[RxJS](http://reactivex.io/rxjs/) is a library for composing asynchronous and callback-based code in a *functional, reactive style*. `Elixor`, produce and consume RxJS `Observables`.

RxJS itself is out-of-scope for this guide. You will find many learning resources on the web. While you can get by with a minimum of RxJS knowledge, you'll want to grow your RxJS skills over time in order to use `Elixor` effectively.

If you're following along with these code snippets, note that you must import the RxJS observable and operator symbols that appear in those snippets. These `ConfigService`imports are typical.

{% code title="getConfig.service.tsx" %}

```typescript
import { Observable, throwError } from 'rxjs';
import { catchError, retry } from 'rxjs/operators';
```

{% endcode %}


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