AWS CloudFormation is a service that helps you model and set up your Amazon Web Services resources. With CloudFormation you create a template that describes all the AWS resources you need (like Amazon EC2 instances or Amazon RDS DB instances), and AWS CloudFormation takes care of provisioning and configuring those resources for you. You don't need to individually create and configure AWS resources and figure out what's dependent on what; AWS CloudFormation handles all of that.
This book provides you with an overview of AWS CloudFormation and shows you how to use CloudFormation templates and stacks. The example project will help you grasp the concepts quickly. You will master the AWS CloudFormation in no time!