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

Why is Notification classes important in Laravel applications, and what problem does it solve for developers? The key reason to understand notification classes is that Laravel applications are usually composed of several layers that must work together predictably. A notification class contains the message data and channel-specific representation of a notification. 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 notification classes: A notification class contains the message data and channel-specific representation of a notification. 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.