Can you explain the concept of multi-tier architecture and its main components?

Multilayer architecture is a way of organizing an application where functionality is divided into separate layers with clear responsibilities. This improves maintainability, scalability, and testability.

Main components:

• Presentation Layer — responsible for user interaction, request processing, and data display.
• Business Logic Layer — contains rules and logic for data processing, implementing the core functions of the application.
• Data Access Layer — responsible for interacting with the database or other storage.

For example, in a Node.js application:

• Express.js handles HTTP requests (Presentation).
• Logic for data handling and business rules is implemented in a separate module (Business Logic).
• ORM or driver is used for database interaction (Data Access).

This separation simplifies maintenance and allows changing one layer without affecting others.