What is Controller responsibilities in Laravel, and what role does it play in a real application?

What is Controller responsibilities in Laravel, and what role does it play in a real application? In Laravel, controller responsibilities should be understood as part of a larger application architecture rather than as an isolated API call. Controllers should coordinate the HTTP request rather than becoming a dumping ground for every business rule. 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: Controllers group related request-handling logic and commonly coordinate validation, services, models, redirects, views and API responses. The specific focus here is controller responsibilities: Controllers should coordinate the HTTP request rather than becoming a dumping ground for every business rule. 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.