# Page opened

Learn how to track when a user opens a page.

This event tracks when a user opens a page, either by clicking a link or typing a URL in the address bar.

The key difference between this event and the [Tab URL changed event](/reference/event/types/web-browsing/tab-url-changed) is that the latter triggers when the URL changes without reloading the page, which is common in single-page applications (SPAs).

And unlike the [Tab opened event](/reference/event/types/web-browsing/tab-opened), which triggers when a new tab is opened, the page opened event fires every time a page is accessed, even within the same tab.

> **Automatically tracked**
>
> The SDK automatically tracks this event when a user accesses a page.

## Input properties

This event has no input properties.

## Processed properties

These properties are automatically tracked:

- `url`: `string`

  The URL of the page the user opened.

- `userAgent`: `string`

  The user-agent of the client.

- `preferredLanguages`: `set<string>`

  An ordered list of the user's preferred languages.

  For example, `["en", "en-CA", "fr-CA"]` indicates preference for English, Canadian English, and Canadian French.

- `referrer`: `string` (optional)

  The URL of the page that linked to the current page.

  The value is `null` if the user accessed the page directly.

## Payload examples

Below are some payload examples for this event:

**Processed payload**

```json
{
  "type": "pageOpened",
  "url": "https://example.com",
  "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0",
  "preferredLanguages": ["en-US"],
  "referrer": "https://google.com"
}
```

## Explore

- [Analytics](/reference/analytics): Learn how to analyze your dashboards.
- [Event-based audiences](/reference/cql/expressions/events/event-types/page-viewed): Learn how to create audiences based on this event.