Can someone help me understand Service - Repository pattern

The Service-Repository pattern is a software design pattern that helps separate concerns in a project by providing a clear separation between the business logic (Service layer) and the data access (Repository layer). This pattern is particularly useful in maintaining a clean architecture and facilitating code reusability and testability. Here's a detailed breakdown: 1. **Service Layer**: - The Service layer acts as the interface for the outside world, exposing methods that encapsulate the business logic. - It interacts with the Repository layer to perform operations related to a specific business entity. - Services can perform complex operations that involve multiple repository interactions, data processing, and business rules. 2. **Repository Layer**: - The Repository layer is responsible for data-related operations, such as CRUD (Create, Read, Update, Delete) operations. - It abstracts the underlying data storage mechanism and provides a consistent interface for data access. - Repositories are typically tied to a specific database table or business entity and do not expose the underlying data access details to the service layer. 3. **Key Benefits**: - **Decoupling**: The Service-Repository pattern decouples the business logic from the data access layer, making it easier to change the data storage mechanism without affecting the business logic. - **Reusability**: Repositories can be reused across different services, promoting code reusability. - **Testability**: The pattern facilitates unit testing by allowing the use of in-memory repositories during tests, making it easier to isolate and test the service layer. 4. **Use Cases**: - It is commonly used in applications developed using frameworks like ASP.NET Core, where it helps in separating concerns and maintaining a clean architecture. - The pattern is also useful in scenarios where the business logic and data storage need to be managed independently, such as in large-scale enterprise applications. In summary, the Service-Repository pattern is a fundamental design pattern in software engineering that helps in organizing code in a way that promotes maintainability, reusability, and testability by separating the business logic from the data access layer.