Terraform
By HashiCorp
Terraform is HashiCorp's open-source infrastructure-as-code tool for defining, provisioning, and managing cloud and on-premises infrastructure through declarative configuration files.
Definition
Terraform is HashiCorp's open-source infrastructure-as-code tool for defining, provisioning, and managing cloud and on-premises infrastructure through declarative configuration files.
Overview
Terraform lets teams describe the desired state of their infrastructure — servers, networks, databases, load balancers — in a human-readable configuration language (HCL), rather than clicking through cloud consoles or writing imperative scripts. Terraform compares this desired state against the real infrastructure using a state file, computes the difference, and generates an execution plan showing exactly what will be created, changed, or destroyed before anything is applied. This provider-based architecture is what gives Terraform its broad reach: providers exist for AWS, Azure, Google Cloud, and hundreds of other services, letting a single tool and workflow manage infrastructure across multiple clouds and even manage resources inside a Kubernetes cluster. Modules allow teams to package and reuse common infrastructure patterns — a standard VPC layout or a Kubernetes cluster setup — across projects and environments. Terraform is often discussed alongside configuration-management tools like Ansible: Terraform focuses on provisioning the infrastructure itself, while Ansible (or Terraform's own provisioners) typically handles configuring software once machines exist. It's also part of a broader HashiCorp toolchain that includes Vault for secrets management and Packer for building machine images. Because infrastructure as code is now a baseline DevOps skill, courses like Terraform & Infrastructure as Code and posts such as Infrastructure as Code Explained: Terraform Basics are common starting points for engineers picking it up.
Key Features
- Declarative configuration language (HCL) describing the desired end-state of infrastructure
- Execution plans that preview exactly what will change before anything is applied
- State file tracking the real-world resources Terraform manages
- Provider ecosystem covering AWS, Azure, GCP, Kubernetes, and hundreds of other services
- Reusable modules for packaging common infrastructure patterns
- Remote state backends and locking for safe collaboration across teams
- Import capability for bringing existing, manually created infrastructure under management
- Workspaces for managing multiple environments (dev, staging, prod) from one configuration
Use Cases
History
Terraform is an open-source infrastructure-as-code tool from HashiCorp that lets teams define, provision, and manage cloud and on-prem infrastructure declaratively across many providers. HashiCorp was founded in 2012 by Mitchell Hashimoto and Armon Dadgar, and after AWS introduced CloudFormation in 2011, Hashimoto argued publicly for an open-source, cloud-agnostic equivalent. HashiCorp released Terraform 0.1 in July 2014, initially supporting only AWS and DigitalOcean. Adoption was slow for its first 18 months but accelerated dramatically from around 2017 as the provider ecosystem grew, and Terraform became the de-facto standard for multi-cloud infrastructure as code.
Sources
- HashiCorp — Terraform · as of 2026-07-17
- HashiCorp — "The Story of HashiCorp Terraform with Mitchell Hashimoto" · as of 2026-07-17
Frequently Asked Questions
From the Blog
Infrastructure as Code Explained: Terraform Basics
Clicking through cloud consoles doesn't scale. Infrastructure as Code (IaC) lets you define, version, and automate your cloud resources in code. This guide explains IaC concepts and walks you through Terraform — the most widely used IaC tool.
Read More Cloud & CybersecurityTerraform Basics: Infrastructure as Code on AWS
Terraform lets you define cloud infrastructure in code, version it in Git, and deploy it repeatably. This guide covers providers, resources, variables, outputs, state management, and real AWS examples — from a simple S3 bucket to a complete web server setup.
Read More Cloud & CybersecurityInfrastructure as Code With Terraform
Terraform lets you define cloud infrastructure in code, then create and change it safely and repeatably. Learn the core workflow and key concepts.
Read More Cloud & CybersecurityWhat Is Terraform and How It Works
Terraform is an infrastructure-as-code tool that lets you define cloud resources in declarative files and provision them safely with plan and apply commands.
Read More