This document discusses Infrastructure as Code (IAC) and provides examples of using Terraform to define and manage infrastructure across multiple cloud providers. It introduces IAC as treating infrastructure like software that can be defined, versioned, tested, and managed through code. Common IAC tools like Terraform, Google Deployment Manager, and Azure Resource Manager are mentioned. The document then provides a sample Terraform configuration that defines AWS VPCs and sets up a peering connection between them to demonstrate how Terraform can provision and manage cloud infrastructure.