CloudFormation parameters are the input values you define when creating or updating your stack, similar to how you provide parameters to any command-line tools you might use. They allow you to customize your stack without making changes to your template. Common examples of what parameters might be used for are as follows:
- EC2 AMI ID: You may wish to redeploy your stack with a new AMI that has the latest security patches installed.
- Subnet IDs: You could have a list of subnets that an auto scaling group should deploy servers in. These subnet IDs will be different between your dev, test, and production environments.
- Endpoint targets and credentials: These include things such as API hostnames, usernames, and passwords.
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