When should I use repository pattern?

The repository pattern is intended to create an abstraction layer between the data access layer and the business logic layer of an application . It is a data access pattern that prompts a more loosely coupled approach to data access.2 Ara 2020

Repository pattern are mostly used where we need to modify the data before passing to the next stage . It centralizes data logic or business logic and service logic. It gives a substitution point for the unit tests.

A Repository pattern is a design pattern that mediates data from and to the Domain and Data Access Layers ( like Entity Framework Core / Dapper). Repositories are classes that hide the logics required to store or retreive data.

Repository: Mediates between the domain and data mapping layers using a collection-like interface for accessing domain objects. He himself categorizes the pattern as “Object-Relational Metadata Mapping “.