Why is it important to separate presentation and business logic in an application?

Separation of presentation (UI) and business logic ensures:

• Testability: Business logic can be tested independently of the UI.
• Modularity: Components become more autonomous and reusable.
• Flexibility: UI can be easily changed or replaced without affecting business logic.
• Manageability: Simplifies maintenance and development of the application.
• Scalability: Allows the application to be effectively worked on by a large team.

This is the basis of architectural patterns such as MVC, MVP, MVVM, MVI.