# Academy textbook > The student reference text of a PhotoRobot Academy module. Category: Training and certification. A textbook is the reference part of a training module: concepts, examples and decision frameworks, as opposed to the exercises in a workbook. Each module has one. ## How PhotoRobot uses it Every PhotoRobot Academy module has a textbook. It is part of the course material for enrolled students; the public [curriculum outline](https://www.photorobot.com/academy/curriculum) shows what each module covers. ## Related terms - [Academy workbook](https://www.photorobot.com/glossary/academy-workbook): The exercises of a PhotoRobot Academy module: scenarios, tasks and self-check questions. - [Academy module](https://www.photorobot.com/glossary/academy-module): The basic unit of the PhotoRobot Academy curriculum: one topic in 30 to 90 minutes.