# Using Deep Linking

This chapter describes how to construct URLs that transition from an external site to a Discovery Framework target page.

- About deep linking
  Deep linking allows users to construct URLs that take them from an external site to a target page in the Discovery Framework. In effect, these URLs act as external bookmarks to the Discovery Framework.
- Deep linking URL format
  Deep linking uses the `deeplink` URL query parameter to create external bookmarks to the Discovery Framework.
- Deep linking syntax
  The deeplink parameter value is a JSON array of data source states keyed by data source ID.
- Deep linking examples
  This topic contains a number of examples of deep linking URLs.
- Resetting data source query state
  To reset a data source's query state back to its base state, you pass it an empty filter.
- How security is handled with deep linking
  Authentication and page authorization for the deep linking feature are handled by the Liferay Portal.