HashiCorp Terraform is a Continuous Configuration Automation tool used to provision and manage infrastructure resources such as Cloud instances, containers, and physical machines. The Cloudsmith Provider allows Terraform to access the Cloudsmith API and manage two resources: repositories and entitlement tokens. To get started with using Terraform with Cloudsmith, users need to add the required providers and credentials to their Terraform module, including an API key for the Cloudsmith Provider. Users can then create resources such as repositories and entitlement tokens by running `terraform init`, adding data sources, and specifying resource arguments. Once created, these resources can be managed and versioned like any other source code.