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A Repository is a Domain-Driven Design concept but it is also a standalone pattern. Repositories are an important part of the domain layer and deal with the encapsulation of objects persistence and reconstitution. A Repository implementation provides the illusion of having an in-memory collection available, where all the objects of a certain class are kept. Actually, the Repository implementation has dependencies on a database or filesystem where thousands of entities are saved as it would be impractical to maintain all the data in the main memory of the machine which runs the application.