Infrastructure as Code (IaC) has significantly evolved, transforming infrastructure management by integrating software engineering principles such as testing, version control, and continuous integration. By 2025, leading organizations treat infrastructure provisioning akin to software development, utilizing tools that support both declarative and imperative programming languages. Key IaC tools like Pulumi, Terraform, and AWS Cloud Development Kit (CDK) facilitate this transformation by providing multi-cloud support, state management, and preview capabilities, which enable teams to define infrastructure through code rather than manual configurations. As infrastructure complexity increases, tools that offer comprehensive testing, abstraction, and collaboration become essential, particularly for teams with programming backgrounds. The guide emphasizes the importance of selecting IaC tools based on team expertise, infrastructure complexity, and organizational needs, while also highlighting the role of security and compliance tools in ensuring robust infrastructure management. Looking forward, the landscape is shifting towards software engineering convergence, real-time cloud integration, and AI-enhanced development, promising further advancements in infrastructure management.