What file extension is typically used for Terraform configuration files?

The file extension typically used for Terraform configuration files is .tf. This extension indicates that the file contains Terraform's HCL (HashiCorp Configuration Language) syntax, which defines the infrastructure as code resources, modules, and other configurations needed to provision and manage the infrastructure.

Using .tf files, users can write declarative configuration for cloud resources. The .tf files are processed by the Terraform command-line interface, allowing users to plan and apply infrastructure changes based on the defined configurations.

In contrast, .tfstate files serve a different purpose; they are generated and maintained by Terraform to keep track of the current state of the infrastructure. The .tfr extension is not standard and does not relate to Terraform's file types, while .tfvar files are used specifically for variable definitions, enabling the separation of variables from the main configuration. However, the core Terraform configuration remains primarily within .tf files.