In what situations is it recommended to use Data Transfer Object (DTO)?

Data Transfer Object (DTO) is recommended to be used in the following situations:

• When you need to transfer data between layers of an application (for example, between the business logic layer and the presentation layer) and want to avoid transferring redundant information.
• To simplify serialization and deserialization of data when interacting with external services or APIs.
• To separate the internal data model from the external presentation, which enhances security and flexibility.
• When it is necessary to aggregate data from multiple sources into a single object for transfer.

Example of DTO in Java:

public class UserDTO {
    private String name;
    private String email;

    // Constructors, getters, and setters
}

This object can be used to transfer only the necessary user fields without revealing the entire internal structure of the model.