Infrastructure as Code (IaC) is the practice of managing and provisioning computing infrastructure through machine-readable definition files rather than physical hardware configuration or interactive configuration tools. The article emphasizes the importance of obtaining buy-in from management and team members to successfully transition to IaC, which replaces ambiguous manual processes with clear, declarative programming. It highlights the benefits of using tools like Terraform with CircleCI for automating the provisioning of infrastructure, showcasing determinism, visibility, and automation as key advantages. The text also discusses the importance of documenting existing processes, storing them in version control systems, and iteratively improving them. It suggests adopting a structured approach to writing infrastructure code and emphasizes the exponential productivity gains of IaC, CI/CD, and DevOps practices, which contribute to faster feature development and better adaptability to market changes.