Infrastructure as Code Define, deploy, and manage cloud infrastructure using declarative configuration. Covers Terraform (multi-cloud), AWS CloudFormation, and Pulumi (code-first), with patterns for compute, networking, storage, databases, and state management. When to Use - Setting up cloud infrastructure (VPCs, EC2, Lambda, S3, RDS, etc.) - Writing or modifying Terraform configurations - Managing Terraform state (remote backends, workspaces, imports) - Creating CloudFormation templates - Using Pulumi for infrastructure in TypeScript/Python/Go - Planning and previewing infrastructure changes…