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Define infrastructure in files, not clicks, and get review, repeatability, and history for free.
Quick Definition
Infrastructure as Code (IaC) is the practice of defining and provisioning infrastructure through machine-readable configuration files rather than manual setup. Tools like Terraform make environments repeatable, version-controlled, and auditable, and IaC is a foundation for automation and cost governance.
Infrastructure as Code, or IaC, is the practice of defining servers, networks, databases, and permissions in machine-readable files instead of creating them by hand in a console. Tools like Terraform read those files and make the cloud match them, the same way every time.
The benefits compound. Environments become reproducible: staging really matches production. Changes become reviewable: a pull request shows exactly what will be created and, increasingly, what it will cost. History becomes auditable: Git records who changed what and when. And drift detection becomes possible, because there is finally a definition of correct to compare against.
Example. A team's entire environment, 200 resources, is defined in code. When they need an identical setup in a new region for compliance, they change two variables and apply. The build takes 40 minutes instead of a quarter.
For cost teams, IaC is the enforcement point: tagging rules and size limits checked at review time prevent waste before it exists. Start with What Is Infrastructure as Code? and the CI/CD best practices guide.
Terraform is the cross-cloud standard. Each provider also offers a native option, and Kubernetes workloads typically use YAML manifests.
Yes. Even a few files beat undocumented console clicks, and the habit pays off most when the team and estate grow.
It makes cost visible at review time, enforces tagging and sizing policies automatically, and lets unused environments be destroyed and recreated safely.