What is the purpose of Terraform modules?

The purpose of Terraform modules is to encapsulate and group related resources for reusability and organization. By utilizing modules, you can create a set of resources that are commonly used together, thereby promoting best practices and reducing duplication in your infrastructure code. This modular approach allows teams to standardize configurations, making it easier to manage and understand complex Terraform projects.

Modules enhance collaborative development as they allow different teams or individuals to share and use predefined configurations efficiently. This leads to improved maintainability, as you can update the resources within a module without having to change every instance where that module is utilized in your Terraform scripts.

In contrast, the other options do not align with the actual function of Terraform modules. Indicating deprecated resources, increasing configuration file size, and automating backups of the Terraform state do not relate to the core purpose of modules, which fundamentally revolves around organizing and reusing infrastructure code effectively.