Which AWS service enables you to define and provision your cloud infrastructure using templates (in other words, manage infrastructure as code)?

AWS CloudFormation is the correct answer because it allows you to define and provision AWS infrastructure as code using templates. These templates, written in JSON or YAML, describe the desired state of your resources, enabling consistent and repeatable deployments. AWS CodePipeline is incorrect because it is a continuous delivery service that automates release pipelines for fast and reliable application and infrastructure updates, not for defining infrastructure as code. AWS CodeDeploy is incorrect because it automates code deployments to various compute services, focusing on the deployment process rather than infrastructure definition. AWS Direct Connect is incorrect because it provides a dedicated network connection from your premises to AWS, which is a networking service, not an infrastructure as code tool.