What is AWS CloudFormation?

AWS CloudFormation is a service that helps you model and set up your Amazon Web Services resources so you can spend less time managing those resources and more time focusing on your applications. Here's how it works:

1. Understand the Service: AWS CloudFormation allows you to use programming languages or a simple text file to model and provision, in an automated and secure manner, all the resources needed for your applications across all regions and accounts.

2. Create a Template: You start by creating a CloudFormation template, which is a JSON or YAML-formatted text file. The template describes all the AWS resources you need to run your application.

3. Deploy Resources: You then use AWS CloudFormation to deploy the resources described in your template. CloudFormation takes care of determining the right operations to perform when managing your stack, and rolls back changes automatically if errors are detected.

4. Manage Resources: You can easily update your stack or replicate it for other projects by modifying and redeploying your template. You can also manage and monitor resources within a stack from the AWS Management Console.

5. Delete Resources: When you no longer require a set of resources, you can delete the stack, and all associated resources are cleaned up for you.

In summary, AWS CloudFormation is a service that helps you model and provision AWS resources in an automated and secure manner.