> For the complete documentation index, see [llms.txt](https://trillo.gitbook.io/trillo-workbench-lessons/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trillo.gitbook.io/trillo-workbench-lessons/introduction/sample-application.md).

# Sample Application

This page provides details about the sample application being used throughout  the lessons

The sample application used for the lesson is an order management application. The following are the main classes/tables of the application.

1. Customer: A customer in the order management system.
2. Order: A customer’s order.
3. LineItem: Items included in the order.
4. Customer to Order is 1 to many.
5. Order to LineItem is 1 to many.

In addition to these, we will refer to several classes provided by Trillo Workbench (called System classes). 

1. User
2. Folder
3. File
4. …