Provider Terraform is a Crossplane provider that lets you manage resources using virtual Terraform workspaces. It is developed and supported by Upbound. Available resources and their fields can be found in the Upbound Marketplace.
Managed Resources (MR) are Crossplane's representation of a resource in a cloud provider. Managed Resources are opinionated, Crossplane Resource Model (XRM) compliant Kubernetes Custom Resources that are installed by the provider.