export const metadata = {
  title: `${pageNumber} Build Custom Features`,
}

# {metadata.title}

In this chapter, you'll learn about the concepts you need to build custom features in your Medusa application.

To add a custom feature to your application, you create:

1. A module with data models and a main service to manage them.
2. A workflow to create, update, and delete records of data models. You implement functionalities in a workflow to benefit from features such as roll-back in case of errors, retry configurations, and more.
3. An API route that exposes the workflow's functionality to clients, such as the storefront or admin dashboard.

![Diagram showcasing the flow of a custom developed feature](https://res.cloudinary.com/dza7lstvk/image/upload/v1725867628/Medusa%20Book/custom-development_nofvp6.jpg)

---

## Next Chapters: Brand Module Example

In the next chapters, you'll follow an example to:

1. Add a Brand Module that creates a `Brand` data model and provides data-management features.
2. Add a workflow to create a brand.
3. Expose an API route that allows admin users to create a brand using the workflow.