AWS CloudFormation is a service provided by Amazon Web Services that allows users to define and manage their cloud resources using code. With CloudFormation, you can create templates in JSON or YAML format that describe the desired state of your infrastructure, including servers, databases, and networking components. This enables you to automate the deployment and management of resources, ensuring consistency and reducing the risk of human error. By using CloudFormation, you can easily replicate environments, making it ideal for development, testing, and production setups. It also supports version control, allowing you to track changes to your infrastructure over time. Overall, CloudFormation simplifies the process of managing cloud resources efficiently.