What Is Infrastructure as Code (IaC)?

What infrastructure as code is

Infrastructure as code, often abbreviated IaC, is the practice of managing and provisioning computing infrastructure, like servers, networks, and other resources, through machine-readable definition files rather than through manual setup. Instead of clicking through screens or configuring servers by hand, you describe the infrastructure you want in code, and tools create and manage it for you. This treats infrastructure the way software developers treat code, bringing the same rigor and automation to managing systems.

Why it exists

Traditionally, setting up infrastructure meant manual, repetitive work: configuring servers by hand, which was slow, error-prone, and hard to reproduce exactly. As systems grew larger and more dynamic, especially in the cloud, this approach could not keep up. Infrastructure as code arose to solve these problems by automating infrastructure setup and making it consistent and repeatable. It brings the benefits of software practices, like version control and automation, to the world of infrastructure management.

How it works

With infrastructure as code, you write definition files that describe the desired state of your infrastructure, what resources you want and how they should be configured. Specialized tools read these files and automatically create, change, or remove infrastructure to match. Because the infrastructure is defined in code, you can store it in version control, review changes, and reuse definitions. Running the same code produces the same infrastructure, every time, reliably and automatically.

The benefits

Infrastructure as code offers major benefits. Consistency: the same code produces the same environment, eliminating the subtle differences that plague manually configured systems. Speed: infrastructure can be set up and torn down quickly and automatically. Repeatability: you can recreate environments reliably, which is great for testing and recovery. Version control: changes to infrastructure are tracked like code, making them reviewable and reversible. Together these make managing infrastructure faster, safer, and more reliable.

Where it fits

Infrastructure as code is a cornerstone of modern DevOps and cloud computing. It pairs naturally with the cloud, where resources are created and destroyed on demand, and with automated pipelines that build, test, and deploy software. By defining infrastructure in code, teams can manage complex, large-scale systems reliably and integrate infrastructure changes into their development workflows. It has become a standard practice for organizations running significant infrastructure, especially in the cloud.

Why it matters

Infrastructure as code transformed how organizations manage their computing infrastructure, replacing slow, error-prone manual work with fast, consistent automation. Understanding what IaC is clarifies a key practice behind modern cloud and DevOps, and why defining infrastructure in code makes systems more reliable and manageable. For anyone interested in how modern software and systems are built and run, infrastructure as code is an important concept.

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See also: What is the cloud? IaaS, PaaS, SaaS explained, What is Docker? Containers explained for beginners.

Sources

• Infrastructure as code - Wikipedia

Published date reflects the original event date (2023-08-08). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.