What is Request whitelisting in Laravel, and what role does it play in a real application?

What is Request whitelisting in Laravel, and what role does it play in a real application? In Laravel, request whitelisting should be understood as part of a larger application architecture rather than as an isolated API call. Even with model protection, controllers should pass only the fields the operation intentionally accepts. 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: Mass assignment controls which attributes may be assigned through methods such as create and fill, helping prevent unintended fields from being populated from request data. The specific focus here is request whitelisting: Even with model protection, controllers should pass only the fields the operation intentionally accepts. 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.