Infrastructure as Code (IaC) is a practice that involves managing and provisioning infrastructure resources through code, rather than manually configuring them. With IaC, organizations can leverage the benefits of automation, scalability, and consistency in their infrastructure processes.

One popular tool used for implementing IaC is Terraform. It provides a declarative language that allows you to define infrastructure configurations in a human-readable format. These configurations, often written in files with .tf extension, describe the desired state of your infrastructure.

For example, you can use Terraform to provision virtual machines, define networking setups, and even manage cloud services like AWS Lambda functions. By writing code to define your infrastructure, you can easily version control and apply changes to your infrastructure resources, bringing agility to your IT operations.