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---
title: Server-side Rendering (SSR)
description: Use Server-side Rendering to render pages on each request.
---
> Also referred to as "SSR" or "Dynamic Rendering".
If a page uses **Server-side Rendering**, the page HTML is generated on **each request**.
To use Server-side Rendering for a page, you need to `export` an `async` function called `getServerSideProps`. This function will be called by the server on every request.
For example, suppose that your page needs to pre-render frequently updated data (fetched from an external API). You can write `getServerSideProps` which fetches this data and passes it to `Page` like below:
```jsx
export default function Page({ data }) {
// Render data...
}
// This gets called on every request
export async function getServerSideProps() {
// Fetch data from external API
const res = await fetch(`https://.../data`)
const data = await res.json()
// Pass data to the page via props
return { props: { data } }
}
```
As you can see, `getServerSideProps` is similar to `getStaticProps`, but the difference is that `getServerSideProps` is run on every request instead of on build time.
To learn more about how `getServerSideProps` works, check out our [Data Fetching documentation](/docs/pages/building-your-application/data-fetching/get-server-side-props).
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