Why is Notifiable models important in Laravel applications, and what problem does it solve for developers?

Why is Notifiable models important in Laravel applications, and what problem does it solve for developers? The key reason to understand notifiable models is that Laravel applications are usually composed of several layers that must work together predictably. A model implementing the required notification contract can receive notifications through configured channels. Ignoring that boundary can lead to duplicated logic, poor security, unnecessary database work, or code that is difficult to test. Why it matters in practice: Laravel notifications provide a common abstraction for sending user messages through supported channels such as mail and database storage. The specific focus here is notifiable models: A model implementing the required notification contract can receive notifications through configured channels. This question is designed to test not only terminology, but also how the concept fits into Laravel's request, application, database, security, or deployment workflow.