# Root Module

> The top-level OpenTofu module that is deployed directly via Terragrunt.

A *root module* is the top-level OpenTofu/Terraform module that is deployed directly into your infrastructure. It is the entry point for a deployment unit and is configured by a `terragrunt.hcl` file.

Root modules differ from submodules in that they:

- Are invoked directly by Terragrunt via `terragrunt apply`
- Maintain their own Terraform state file
- Define provider configurations
- Can declare dependencies on other root modules

In the Panfactum stack, root modules typically live in `packages/infrastructure/` (for Panfactum-provided modules) or in the directory specified by the `iac_dir` repo variable (for first-party modules).