Infrastructure as Code (IaC) is a DevOps practice that manages and provisions computing infrastructure through machine-readable configuration files rather than manual processes or interactive configuration tools. By treating infrastructure definitions as software artifacts, teams can apply the same version control, code review, and testing practices to their servers, networks, and cloud resources as they do to application code.
IaC tools fall into two primary categories: declarative and imperative. Declarative tools like Terraform and AWS CloudFormation allow engineers to define the desired end state of infrastructure, and the tool determines how to achieve it. Imperative tools like Ansible and Chef specify the exact sequence of commands to execute. Both approaches enable repeatable, consistent deployments across multiple environments.
Adopting Infrastructure as Code delivers real advantages for organizations of any scale. It eliminates configuration drift, where environments gradually diverge from their intended state, by ensuring every deployment follows the same blueprint. IaC also accelerates disaster recovery, simplifies environment replication, and provides a complete audit trail of infrastructure changes, making it a core practice for modern cloud-native operations.