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  Terraform Modules: Building Reusable Infrastructure 📅 Published: August 2026 ⏱️ Estimated Reading Time: 15 minutes 🏷️ Tags: Terraform, Modules, Infrastructure as Code, Reusability Introduction: What is a Terraform Module? A module is a container for multiple resources that are used together. It's like a function in programming—you define it once, give it a clear interface, and reuse it everywhere. Instead of copying and pasting the same infrastructure code across multiple projects, you package it into a module and reuse it. Think of modules as blueprints: A VPC module might contain VPC, subnets, route tables, and internet gateways A web server module might contain EC2 instances, security groups, and load balancers A database module might contain RDS instances, parameter groups, and security groups Part 1: Why Use Modules? Without Modules With Modules Copy-paste same code everywhere Define once, reuse everywhere 50 lines repeated 10 times 50 lines in module, 5 lines to call ...