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

Why is Login flow important in Laravel applications, and what problem does it solve for developers? The key reason to understand login flow is that Laravel applications are usually composed of several layers that must work together predictably. Authentication verifies credentials or another identity mechanism and establishes the user's authenticated state. 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: Authentication identifies the current user and maintains the authenticated state used by protected application workflows. The specific focus here is login flow: Authentication verifies credentials or another identity mechanism and establishes the user's authenticated state. 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.