Terraform modules are transforming infrastructure patterns into version-controlled, reusable components that can be reused with different input variables. This approach addresses scaling challenges as deployments grow by encapsulating common patterns in modules, enabling controlled version updates and reducing technical debt. As organizations mature their Infrastructure as Code (IaC) practices, they may move from local to external modules, leveraging community-maintained registries like Terraform or OpenTofu for thousands of pre-built infrastructure patterns. However, using externally-sourced modules introduces security risks and requires careful review of implementation details. Infisical integrates with Terraform to provide secure secrets management that works seamlessly with modular infrastructure, solving several problems simultaneously by never persisting sensitive values in state files, reducing the need for redeployments when security policies require password changes, and allowing modules to remain flexible and reusable.