What is MVC (Model-View-Controller)?

What is MVC?

MVC (Model-View-Controller) is an architectural pattern that divides application code into three responsibility areas. The Model handles data and business rules, the View renders what the user sees, and the Controller receives requests and coordinates the right model and response.

In a web application, when a user opens an “orders” page, the Controller handles the request, the Model retrieves order data from the database, and the View renders it as HTML. Database queries, interface templates, and routing decisions do not need to live in the same file.

How the Layers Work

• Model: Manages data structures, validation, business rules, and database operations.
• View: Produces the screen or response shown to the user; it may be HTML, a mobile view, or a JSON representation.
• Controller: Interprets requests, calls the required model logic, and decides which response to return.

MVC does not mean the layers never communicate. It means each layer has a clear job, which makes tests, interface changes, and new business rules easier to manage.

Where MVC is Used

Ruby on Rails, Laravel, ASP.NET MVC, and Spring MVC all use versions of this approach. Modern frontend frameworks may not look like classic MVC, but the idea of separating state, rendering, and interaction flow remains useful.

As a design pattern, MVC helps medium and large applications stay readable. In a small prototype, too much layering can slow the team down, so the decision should follow the complexity of the application rather than the name of the pattern.