Automation of infrastructure, called Infrastructure-as-code(IaC), is a method of provisioning and managing information centers through machine-readable definition files, instead of physical hardware configuration or interactive configuration tools.

Infrastructure, as code IaC approaches, is often associated and promoted for cloud computing, which is typically marketed as Infrastructure as a Service (Iaas). But it is not the same.
IaC mainly a customized definition of infrastructure depending on the specific needs for a business. There are many tools that can help you automate your infrastructure mainly classified as “configuration management” tools.

Configuration management tools like Chef, Puppet, Ansible and the others on this list help configure the software and systems on this infrastructure that has already been provisioned. 

Configuration orchestration tools, which include terraform and AWS CloudFormation etc., are designed to automate the deployment of servers and other infrastructure.

An ideal IaC will be a perfect blend of the two.