What is Mailable classes in Laravel, and what role does it play in a real application?

What is Mailable classes in Laravel, and what role does it play in a real application? In Laravel, mailable classes should be understood as part of a larger application architecture rather than as an isolated API call. Mailable classes encapsulate the subject, view and data for an email message. A strong understanding includes its purpose, the layer where it belongs, the data or request flow it affects, and the situations where another mechanism may be more appropriate. Practical context: Laravel mail features provide a structured way to create and send application emails using configurable mail transports and templates. The specific focus here is mailable classes: Mailable classes encapsulate the subject, view and data for an email message. 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.