Seeders allow you to populate your database with sample or dummy data. They are typically used during the development phase of a project to quickly fill the database with predefined data that can be used for testing or to mimic production scenarios.

Seeders are very useful for setting up initial data for your application, especially when you need consistent data during development or when setting up automated tests. They help streamline the process of populating your database with test data and can be a part of your application's version control for easier deployment and environment setup.