Workflows are typically used to route submitted data for review and approval. Workflows are created using the workflow editor in AEM. The Workflows can be triggered on Adaptive Form submission.
Please make sure you have a working instance of AEM Forms. Please follow the installation guide to install and configure AEM Forms
The following video explains the creation of Review and Approval workflow using AEM Forms Components
If for some reason you are not able to build the workflow, you can download the completed workflow from here and import the same using package manager in to your AEM instance.