What is Flash data in Laravel, and what role does it play in a real application?

What is Flash data in Laravel, and what role does it play in a real application? In Laravel, flash data should be understood as part of a larger application architecture rather than as an isolated API call. Flash session data is intended for short-lived messages such as success or error notices after redirects. 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 sessions persist server-side user state across requests, while cookies store small client-side values sent back with subsequent requests. The specific focus here is flash data: Flash session data is intended for short-lived messages such as success or error notices after redirects. 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.