MVC Architecture

Using MVC (Model-View-Controller) architecture in Spring Boot (or any web application) provides clear separation of concerns, making your code easier to manage, scale, and test. Here's why MVC is important:

✅ 1. Separation of Concerns

Each layer (Model, View, Controller) has a specific responsibility:

Model: Handles data and business logic.
View: Displays data (HTML, Thymeleaf, etc.).
Controller: Manages HTTP requests and responses.

🔍 Result: Easier debugging, testing, and maintenance.

✅ 2. Scalability

As your application grows:

You can add new views without changing the business logic.
You can change data logic without touching the UI or controller.

✅ 3. Reusability

Business logic in services and data models can be reused across multiple controllers or APIs.

✅ 4. Testability

You can unit test each layer independently:
- Mock the repository for service tests.
- Mock the service for controller tests.

✅ 5. Maintainability

Cleanly structured projects are easier to understand for new developers.
Reduces coupling and increases cohesion.

✅ 6. Industry Standard

Widely adopted pattern in enterprise applications.
Encouraged by Spring Boot's auto-configuration and annotations.

🧠 Example Scenario

If you're building a banking app:

Model: Account, Transaction entities.
View: HTML pages showing account details.
Controller: Handles requests like /balance or /transfer.
Service: Contains logic like calculating interest or validating transfers.

🚀 Summary: Why MVC?

Layer	Responsibility	Benefits
Model	Business logic & data	Reusable & testable logic
View	User Interface	Clean and maintainable UI
Controller	Request handling & flow	Centralized control & routing