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Correlations: Update docs to include information on external correlation type (#93772)

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Change docs to reflect different correlation types
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docs/sources/administration/correlations/_index.md
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# Correlations
You can create interactive links for Explore visualizations to run queries related to presented data by setting up Correlations.
You can create interactive links for Explore visualizations by setting up Correlations. These links can either run queries or generate external URLs related to presented data.
A correlation defines how data in one [data source]({{< relref "../../datasources" >}}) is used to query data in another data source.
A correlation defines how data in one [data source]({{< relref "../../datasources" >}}) is used to query data in another data source or to generate an external URL.
Some examples:
- an application name returned in a logs data source can be used to query metrics related to that application in a metrics data source, or
- a user name returned by an SQL data source can be used to query logs related to that particular user in a logs data source
- a customer ID in a logs data source can link to a different platform that has a profile on that customer.
[Explore]({{< relref "../../explore" >}}) takes user-defined correlations to display links inside the visualizations.
You can click on a link to run the related query and see results in [Explore Split View]({{< relref "../../explore#split-and-compare" >}}).
If a correlation links to a query, you can click on that link to run the related query and see results in [Explore Split View]({{< relref "../../explore#split-and-compare" >}}).
If a correlation links to an external URL, you can click on the link to open the URL in a new tab in your browser.
Explore visualizations that currently support showing links based on correlations: