# Multicasting

In RxJS observables are cold, or unicast by default. These operators can make an observable hot, or multicast, allowing side-effects to be shared among multiple subscribers.

## Contents

* [publish](https://www.learnrxjs.io/learn-rxjs/operators/multicasting/publish)
* [multicast](https://www.learnrxjs.io/learn-rxjs/operators/multicasting/multicast)
* [share](https://www.learnrxjs.io/learn-rxjs/operators/multicasting/share) ⭐
* [shareReplay](https://www.learnrxjs.io/learn-rxjs/operators/multicasting/sharereplay) ⭐

⭐ - *commonly used*

### Additional Resources

* [Hot vs Cold Observables](https://medium.com/@benlesh/hot-vs-cold-observables-f8094ed53339#.8x9uam5rg) 📰 - Ben Lesh
* [Unicast v Multicast](https://github.com/zenparsing/es-observable/issues/66) 📰 - GitHub Discussion
* [Demystifying Hot and Cold Observables](https://egghead.io/lessons/rxjs-demystifying-cold-and-hot-observables-in-rxjs) 🎥 - André Staltz