71 lines
3.0 KiB
Markdown
71 lines
3.0 KiB
Markdown
---
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layout: "language"
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page_title: "Modules Overview - Configuration Language"
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description: |-
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Modules are containers for multiple resources that are used together in a configuration. Find resources for using, developing, and publishing modules.
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---
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# Modules
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> **Hands-on:** Try the [Reuse Configuration with Modules](https://learn.hashicorp.com/collections/terraform/modules?utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) collection on HashiCorp Learn.
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_Modules_ are containers for multiple resources that are used together. A module
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consists of a collection of `.tf` and/or `.tf.json` files kept together in a
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directory.
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Modules are the main way to package and reuse resource configurations with
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Terraform.
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## The Root Module
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Every Terraform configuration has at least one module, known as its
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_root module_, which consists of the resources defined in the `.tf` files in
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the main working directory.
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## Child Modules
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A Terraform module (usually the root module of a configuration) can _call_ other
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modules to include their resources into the configuration. A module that has
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been called by another module is often referred to as a _child module._
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Child modules can be called multiple times within the same configuration, and
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multiple configurations can use the same child module.
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## Published Modules
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In addition to modules from the local filesystem, Terraform can load modules
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from a public or private registry. This makes it possible to publish modules for
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others to use, and to use modules that others have published.
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The [Terraform Registry](https://registry.terraform.io/browse/modules) hosts a
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broad collection of publicly available Terraform modules for configuring many
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kinds of common infrastructure. These modules are free to use, and Terraform can
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download them automatically if you specify the appropriate source and version in
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a module call block.
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Also, members of your organization might produce modules specifically crafted
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for your own infrastructure needs. [Terraform Cloud](/docs/cloud/index.html) and
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[Terraform Enterprise](/docs/enterprise/index.html) both include a private
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module registry for sharing modules internally within your organization.
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## Using Modules
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- [Module Blocks](/docs/language/modules/syntax.html) documents the syntax for
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calling a child module from a parent module, including meta-arguments like
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`for_each`.
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- [Module Sources](/docs/language/modules/sources.html) documents what kinds of paths,
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addresses, and URIs can be used in the `source` argument of a module block.
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- The Meta-Arguments section documents special arguments that can be used with
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every module, including
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[`providers`](/docs/language/meta-arguments/module-providers.html),
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[`depends_on`](/docs/language/meta-arguments/depends_on.html),
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[`count`](/docs/language/meta-arguments/count.html),
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and [`for_each`](/docs/language/meta-arguments/for_each.html).
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## Developing Modules
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For information about developing reusable modules, see
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[Module Development](/docs/language/modules/develop/index.html).
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