What is Write transformation in Laravel, and what role does it play in a real application?

What is Write transformation in Laravel, and what role does it play in a real application? In Laravel, write transformation should be understood as part of a larger application architecture rather than as an isolated API call. A mutator can normalize or transform a value before it is persisted. 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: Eloquent attribute transformations let models present or normalize attribute values through reusable model-level logic. The specific focus here is write transformation: A mutator can normalize or transform a value before it is persisted. 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.