Description: An update request in AWS CloudFormation is a process by which a user can modify an existing stack or one of its resources. This mechanism allows system administrators and developers to implement changes to the infrastructure in a controlled and predictable manner. When making an update request, resources within the stack can be added, removed, or modified, facilitating infrastructure management as code. AWS CloudFormation uses templates in JSON or YAML format to define the desired infrastructure, and when an update request is submitted, the service evaluates the differences between the current configuration and the new one, applying only the necessary changes. This approach not only optimizes deployment time but also minimizes the risk of errors, as it allows users to review and validate changes before applying them. Additionally, CloudFormation offers the ability to perform updates in a safe mode, meaning that if something goes wrong during the process, it can revert to the previous version of the stack. In summary, the update request is an essential tool for efficient and effective cloud resource management, allowing organizations to quickly adapt to changing business needs.