# Source: https://react.dev/reference/rsc/directives

---
title: Directives
---

<RSC>

Directives are for use in [React Server Components](/reference/rsc/server-components).

</RSC>

<Intro>

Directives provide instructions to [bundlers compatible with React Server Components](/learn/start-a-new-react-project#full-stack-frameworks).

</Intro>

---

## Source code directives {/*source-code-directives*/}

* [`'use client'`](/reference/rsc/use-client) lets you mark what code runs on the client.
* [`'use server'`](/reference/rsc/use-server) marks server-side functions that can be called from client-side code.