Service Layer
The Service Layer is a design pattern in software architecture that encapsulates business logic and coordinates operations between the presentation layer (UI) and the data access layer. It acts as an intermediary, providing a clear API for application functionality while abstracting complex workflows and domain rules. This pattern promotes separation of concerns, making systems more maintainable, testable, and scalable.
Developers should implement a Service Layer when building enterprise or complex applications to centralize business logic, avoid duplication, and ensure consistent application of domain rules across different interfaces (e.g., web, mobile, API). It is particularly useful in layered architectures like MVC or hexagonal architecture, where it decouples UI concerns from core business operations and data persistence, facilitating easier testing and future modifications.