Amazon Web Services CloudFormationis a free service that provides Amazon Web Service (AWS) customers with the tools they need to create and manage the infrastructure a particular software application requires to run on Amazon Web Services.
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When the template is submitted to the service, CloudFormation creates the necessary resources in the customer's account and builds a running instance of the template, putting dependencies and data flows in the right order automatically. The running instance is called a stack.
Customers can make changes to the stack after it’s been deployed by using CloudFormation tools and an editing process that is similar to version control. When a stack is deleted, all related resources are deleted automatically as well.
An important advantage of CloudFormation is that it allows developers to automate service provisioning steps in a fairly simple way. There is no extra charge for AWS CloudFormation; customers only pay for the AWS resources that are required to run their applications.