Infrastructure as Code

Describing servers, networks, and databases in version-controlled files instead of clicking through a console.

Providers, resources, and the plan-then-apply workflow that makes infrastructure changes predictable.

Why Terraform keeps a map of what it already built, and why that file deserves the same care as a credential.

Agentless configuration management: pushing the same setup over SSH to every server in your inventory.

Running terraform plan on every pull request, and catching drift before it catches you.