terraform/website/docs/language/functions/index.mdx

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---
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page_title: Functions - Configuration Language
description: >-
An introduction to the built-in functions that you can use to transform and
combine values in expressions.
---
# Built-in Functions
> **Hands-on:** Try the [Perform Dynamic Operations with Functions](https://learn.hashicorp.com/tutorials/terraform/functions?in=terraform/configuration-language&utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) tutorial on HashiCorp Learn.
The Terraform language includes a number of built-in functions that you can
call from within expressions to transform and combine values. The general
syntax for function calls is a function name followed by comma-separated
arguments in parentheses:
```hcl
max(5, 12, 9)
```
For more details on syntax, see
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[_Function Calls_](/language/expressions/function-calls)
in the Expressions section.
The Terraform language does not support user-defined functions, and so only
the functions built in to the language are available for use. The navigation
for this section includes a list of all of the available built-in functions.
You can experiment with the behavior of Terraform's built-in functions from
the Terraform expression console, by running
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[the `terraform console` command](/cli/commands/console):
```
> max(5, 12, 9)
12
```
The examples in the documentation for each function use console output to
illustrate the result of calling the function with different parameters.