Infrastructure as Code (IaC) is a practice in software development and operations where infrastructure configuration is treated as code. It involves writing and managing infrastructure configurations in a declarative or imperative programming language, rather than manually setting up and configuring infrastructure components.

With IaC, infrastructure resources such as virtual machines, containers, networking, and storage are defined and provisioned using code. This code is typically stored in version control systems and can be easily tracked, updated, and shared among team members.

IaC provides several benefits:

1. Automation: IaC allows for the automation of infrastructure provisioning and configuration, reducing manual work and enabling faster and more reliable deployments.

2. Reproducibility: Infrastructure configurations defined as code can be easily reproduced, allowing for consistent deployments across different environments.

3. Scalability: IaC makes it easier to scale infrastructure resources up or down based on demand, as the configuration can be modified in code.

4. Versioning and collaboration: Infrastructure configurations stored in version control systems enable versioning and collaboration among team members, allowing for easy tracking and rollbacks.

There are different tools available for implementing IaC, such as Terraform, AWS CloudFormation, Azure Resource Manager, and Kubernetes. These tools provide a way to define infrastructure configurations using a domain-specific language or programming language, and then provision and manage the infrastructure resources according to the defined configuration.

Overall, IaC helps streamline infrastructure management, improve reliability, and reduce time and effort required for provisioning and managing infrastructure resources.