Terraform is an open-source infrastructure as code (IaC) tool developed by HashiCorp. It enables users to define and provision data center infrastructure through a high-level configuration language known as HashiCorp Configuration Language (HCL), or optionally JSON. This declarative approach allows users to specify the desired state of their infrastructure in configuration files, which Terraform then uses to create an execution plan, previewing changes before they are applied to ensure accuracy.

Terraform constructs a resource dependency graph, enabling it to manage and apply changes to independent resources in parallel, enhancing efficiency. It automates the process of updating the infrastructure to match the desired state, facilitating continuous delivery and integration. Terraform's robust provider ecosystem supports a wide array of cloud providers and services, allowing seamless management of diverse infrastructure components, from physical servers and virtual machines to containers and network appliances, across different environments including public clouds and on-premises data centers.

This tool's ability to version, share, and reuse infrastructure configurations significantly improves collaboration among teams and simplifies the management of infrastructure at scale. By using Terraform, teams can ensure that their infrastructure remains consistent and reproducible, making it an essential component in modern DevOps practices.

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