Terraform is an infrastructure-as-code (IaC) software tool created by HashiCorp that allows DevOps teams to automate infrastructure provisioning using reusable, shareable, human-readable configuration files. It is a cloud-agnostic, open-source provisioning tool that can manage infrastructure components, including compute, storage, and networking resources, and high-level components like DNS entries. Terraform uses APIs to automatically create and manage infrastructure resources, and it can work with virtually any platform or service with an accessible API. Terraform supports a number of cloud infrastructure providers such as Amazon Web Services, Microsoft Azure, Google Cloud Platform, and Oracle Cloud Infrastructure).

Terraform allows users to describe their complete infrastructure in the form of code, and it generates a plan and prompts for approval before modifying the infrastructure. It also keeps track of the real infrastructure in a state file, which acts as a source of truth for the environment. Terraform can be used to automate infrastructure deployments through existing CI/CD workflows, and it enforces policy guardrails before users create infrastructure using Sentinel policy as code.

In summary, Terraform is a tool that enables users to safely and predictably provision and manage infrastructure in any cloud using a declarative configuration language).