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Terraform is an open-source infrastructure as code (IaC) tool developed by HashiCorp. It allows users to define and provision infrastructure using a declarative configuration language.

1. Declarative Syntax: Terraform configurations are written in HashiCorp Configuration Language (HCL), a domain-specific language that is easy to read and write. Users declare the desired state of their infrastructure, and Terraform takes care of figuring out how to achieve that state.

2. Multi-Cloud Support: Terraform is cloud-agnostic, meaning it supports multiple cloud providers such as Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP), and others. This allows users to manage resources across different clouds using a single set of configurations.

3. Resou rce Graph: Terraform builds a graph of all the resources and dependencies in your configuration, enabling it to optimize the order of resource creation and updates.

4. Plan and Apply: Terraform provides a two-step process for making changes to your infrastructure. First, you run terraform plan to see what changes will be made. Then, you run terraform apply to execute those changes.

5. State Management: Terraform maintains a state file that keeps track of the current state of your infrastructure. This state is used to determine what changes need to be applied and to keep track of resource attributes.

6. Modules:< /strong> Terraform allows you to organize your configurations into reusable modules. Modules can be shared and used across different projects, promoting code reuse and maintainability.