Data Access Object
Data Access Object (DAO) is a design pattern in software development that provides an abstract interface to a database or other persistence mechanism. It separates the business logic layer from the data access layer, allowing data operations to be performed without exposing details of the underlying storage. This pattern typically includes methods for CRUD (Create, Read, Update, Delete) operations, promoting modularity and testability in applications.
Developers should use DAO when building applications that require data persistence, such as web services, enterprise systems, or mobile apps, to decouple business logic from database-specific code. It is particularly useful in scenarios where multiple data sources (e.g., SQL databases, NoSQL databases, APIs) might be used, as it allows for easy swapping of implementations without affecting the rest of the application. This pattern enhances maintainability, reduces code duplication, and facilitates unit testing by enabling mock implementations.