CloudOps Orchestration Service (OOS) uses templates to define the O&M operations that require orchestration. The templates are divided into public templates and custom templates. The template content uses the YAML or JSON format. OOS provides public templates for you to use and reference conveniently. Before executing a template, you must review the operations defined in the template, and execute the template in the test environment to test the execution effect. You can also create a custom template to specify the O&M operations you need.