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

Why is Validated data important in Laravel applications, and what problem does it solve for developers? The key reason to understand validated data is that Laravel applications are usually composed of several layers that must work together predictably. Form Request classes can expose validated data so controllers do not need to re-implement the same checks. 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: Form Request classes encapsulate validation rules and authorization checks for a specific incoming request workflow. The specific focus here is validated data: Form Request classes can expose validated data so controllers do not need to re-implement the same checks. 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.