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

Why is Transaction behavior important in Laravel applications, and what problem does it solve for developers? The key reason to understand transaction behavior is that Laravel applications are usually composed of several layers that must work together predictably. Tests can verify that multi-step failures leave the expected database 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: Laravel database tests verify queries, model behavior, relationships and persistence using controlled test data. The specific focus here is transaction behavior: Tests can verify that multi-step failures leave the expected database 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.