What is Terraform and how does it work?

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The following article explains what Terraform is and how it works.

As an infrastructure-as-code tool, it allows you to declaratively configure, manage, and provision infrastructure resources such as servers, networks, and storage. Furthermore, it is open source. Created by HashiCorp, Terraform manages resources across multiple cloud providers such as AWS, Azure, GCP and others.

Terraform works by defining a desired state of infrastructure resources in a configuration file (in HashiCorp Configuration Language or JSON format) that specifies the resources to be created, their attributes and dependencies. After the configuration file is created, Terraform uses providers to interact with the cloud providers’ APIs to create and manage the resources.

When you run Terraform, it first reads the configuration file, then compares the desired state with the current state of the infrastructure and generates an execution plan to create, update, or delete resources to match the desired state. Finally, Terraform implements the plan by making API calls to the cloud provider to create, update, or delete resources as needed. Terraform also maintains a state file that records the current state of the infrastructure, allowing Terraform to track changes and detect any drift between the desired state and the current state.

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