The machines wait for your command, but they will not move without code. With Infrastructure as a Service (IaaS) and Terraform, that code becomes the single source of truth for everything your cloud does.
IaaS lets you provision compute, storage, and networking on demand. Terraform turns those resources into declarative infrastructure that can be versioned, tested, and deployed like any other software project. No manual clicks. No unpredictable drift.
Terraform reads configuration files written in HashiCorp Configuration Language (HCL). Each file describes the desired state of your IaaS environment—servers, load balancers, DNS records, firewalls. Run terraform apply and it creates or updates those resources exactly as defined. Change the configuration, run the command again, and Terraform reconciles reality to match your plan.
This workflow scales cleanly. Your IaaS provider might be AWS, Azure, Google Cloud, or OpenStack. Terraform’s providers API abstracts the differences so the same code structure can control multiple platforms. You can mix and match services, chain dependencies, and output variables cleanly. State management keeps track of changes, enabling teams to collaborate without overwriting each other’s work.