What is a key feature of AWS CloudFormation?

AWS CloudFormation is designed to create and provision infrastructure in a reliable and automated manner. This means that users can define their infrastructure using a template, which describes the resources needed for their application (like EC2 instances, VPCs, databases, etc.). With CloudFormation, the entire stack of services can be provisioned together, ensuring that resources are created in the correct order and are configured properly. By using infrastructure as code, users can maintain version control and easily replicate environments, which enhances both development and operational processes. This ability to deploy and manage infrastructure in a predictable way is a fundamental feature of AWS CloudFormation, distinguishing it as a powerful tool for infrastructure management in the cloud.

The other options, while they describe various AWS functionalities, do not accurately represent CloudFormation's core capabilities. For instance, managing API calls, monitoring system events, or controlling user access are not specific to CloudFormation and fall under other AWS services’ responsibilities.