Do modules inherit variables from their parent module?

Modules in Terraform are designed to be self-contained units of infrastructure management. This means that each module operates independently, with its own set of input and output variables. The core principle of module design in Terraform is to encapsulate functionality and promote reusability without dependency on the parent module's variable definitions.

When a module is defined, it does not inherit variables from the parent module. Instead, it requires explicit input variables to be passed to it during invocation. This characteristic ensures that modules are reusable and can be maintained and tested in isolation, which is fundamental to achieving modular and clean infrastructure as code practices.

The other choices suggest different scopes of variable inheritance, but they do not align with how Terraform modules function. For example, suggesting that only global or input variables are inherited ignores the essential principle of module isolation. Each module in Terraform should be treated as a distinct entity, which leads to better organization and clarity in infrastructure management.