What is Nested eager loading in Laravel, and what role does it play in a real application?

What is Nested eager loading in Laravel, and what role does it play in a real application? In Laravel, nested eager loading should be understood as part of a larger application architecture rather than as an isolated API call. Related relationships can be eager loaded through nested relationship paths. 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: Eager loading retrieves related data intentionally to reduce repeated relationship queries and avoid common N+1 query patterns. The specific focus here is nested eager loading: Related relationships can be eager loaded through nested relationship paths. 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.