This text introduces the concept of Infrastructure as Code (IaC) using Terraform to deploy and manage Twilio resources, such as TaskRouter workspaces, queues, workers, and workflows. The author provides a step-by-step guide on how to create these resources using Terraform, including initializing the Terraform CLI, creating resource definitions in the main.tf file, and applying the configuration to create the resources. The text also highlights the benefits of IaC, including streamlining the creation of resources, reducing manual errors, and speeding up deployment time. Additionally, it explains how to modify existing resources and destroy created resources using Terraform. The author concludes that IaC can help scale projects and integrate with CI/CD pipelines.