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Functions
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DSL functions, both built-in and user-defined (UDFs), are used by the
`expression language <./expression-language.html>`_ for data processing operations such
as building features, datasets, and metrics.

.. contents:: Sections
   :local:

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Built-ins
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These functions are built-in.

.. autodsl::

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UDFs
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You can extend the native functions library by writing your own UDFs.

For more information on UDFs, refer to the UDF guides here: `User-Defined Functions (UDFs) <./user-defined-functions.html>`_