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AWS's IaC service: declare resources in a JSON/YAML template; CloudFormation provisions and manages them as a stack.
A collection of AWS resources managed as a single unit — create, update, or delete them together from one template.
A preview of how a proposed CloudFormation update will affect running resources before you execute it — reduces risky surprises.
Sections include Parameters (inputs), Conditions, Resources (required), Mappings, and Outputs (returned values).
A PaaS that deploys and manages your application (capacity, load balancing, scaling, health) from uploaded code — you focus on the app.
Web server environment handles HTTP requests; worker environment processes background jobs from an SQS queue.
Reusability, repeatability, version control, and safe automated updates — eliminating manual, error-prone configuration.
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