Terraform Modules

Any directory containing one or more .tf configuration files. Grouping resources this way lets you reuse and standardize a configuration as a single unit.

The module in the main working directory where you run Terraform commands. Every Terraform configuration has exactly one root module.

A module that is called by another module. The root module can call child modules, and those children can call further modules, forming a tree.

The module block: module "NAME" { source = "..." ... }. The label is a local name used to reference the module's outputs.

source. Every module block must specify a source telling Terraform where to find the module's configuration.