The document outlines the concept of Infrastructure as Code (IaC) as a key element of DevOps, emphasizing its importance in automating infrastructure management with practices borrowed from software development. It discusses the benefits of IaC, challenges in manual management, and presents data from the 2017 State of DevOps report showing efficiency gains in high-performing organizations. Various principles, practices, and examples of implementing IaC are also provided, including the use of pipelines and modular infrastructure designs.