> ## Documentation Index
> Fetch the complete documentation index at: /docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Built-in variables

> Unlocking ClickFlare Tag Manager's Power: Explore the Built-In Variables for Enhanced Tracking Efficiency

Built-in variables are a special category of variables that are predefined and cannot be customized. When you create a new container, it initially contains no user-defined variables, but some built-in variables are already enabled. These enabled built-in variables are accessible across ClickFlare Tag Manager whenever variable selection menus are present.

You can access the list of built-in variables, directly from the tags or triggers' section of the container.

To check built-in variable from tag configuration:

1. Click on **+ New Tag**
2. Select a tag configuration, like *Custom Event* for example
3. Next to the variable placeholder, click on the "**+"** symbol
4. Go through the list of built-in variables

![Go through the list of built-in variables](https://mintcdn.com/clickflare/GPmlXVWHNq-9kzLd/images/help-center/07-tag-manager/06-variables/02-built-in-variables-01.png?fit=max\&auto=format\&n=GPmlXVWHNq-9kzLd\&q=85\&s=1c28c1c441f89bf5790c32c3990abca4)

You can do the same from the trigger's configuration.

Related Sources:

* [Built-in variables](/docs/en/tag-manager-1/about-built-in-variables.md)
* [User-defined variables](/docs/en/tag-manager-1/user-defined-variables.md)
* [User-defined variables types](/docs/en/tag-manager-1/custom-variable-types.md)
* [About variables](/docs/en/tag-manager-1/about-variables.md)


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