Orchestration is a service that you can use to orchestrate multiple composite cloud applications. This service supports use of both the Amazon Web Services (AWS) CloudFormation template format through both a Query API that is compatible with CloudFormation and the native OpenStack Heat Orchestration Template (HOT) format through a REST API.
The URL for the REST API can be found in the Project -> Access & Security -> API Access tab.
These flexible template languages enable you to describe and automate the deployment of infrastructure, services, and applications. The templates enable creation of most resource types, such as instances, floating IP addresses, volumes, security groups, and users. The resources, once created, are referred to as stacks.