Infrastructure as Code (IaC) is a transformative approach in software development that allows infrastructure to be provisioned and managed through code rather than manual processes, enabling faster application deployment and reducing the burdens on developers and system administrators. The process involves scripting configuration parameters using a domain-specific language, which is then processed by IaC platforms to create and configure infrastructure. This method promotes consistency, modularity, and version control, making it easier to manage, test, and deploy infrastructure across various environments. Best practices for IaC include continuous integration and deployment, modular infrastructure coding, rigorous testing, and maintaining version control to prevent configuration drift and errors. Popular tools supporting IaC include Terraform, Ansible, Pulumi, and AWS CloudFormation, each offering distinct features to manage cloud environments effectively. While IaC presents challenges such as potential configuration drift and duplication of errors, its adoption is crucial for organizations aiming for automation and agile software development, provided it is implemented thoughtfully with adequate resources and expertise.