CloudFormation templates

This is where we start to get our hands dirty. CloudFormation template files are the codified representation of your stack, expressed in either YAML or JSON. When you wish to create a CloudFormation stack, you push this template file to CloudFormation, through its API, web console, command line tools, or some other method (such as the SDK).

Templates can be replayed over and over again by CloudFormation, creating many instances of your stack.