What is Api contracts in Laravel, and what role does it play in a real application?

What is Api contracts in Laravel, and what role does it play in a real application? In Laravel, API contracts should be understood as part of a larger application architecture rather than as an isolated API call. A resource layer helps keep internal model structure separate from the external JSON contract consumed by clients. 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: API Resources transform models and relationships into controlled JSON representations so APIs can expose a stable response structure. The specific focus here is API contracts: A resource layer helps keep internal model structure separate from the external JSON contract consumed by clients. 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.