ASP.NET MVC is a web framework that implements the Model-View-Controller pattern. A controller handles the request, works with the model (the data and business logic), and returns a view (the HTML). It gives you full control over markup, clean separation of concerns and testable controllers, unlike the older Web Forms model. The three roles: Model — the domain objects, view models and the logic that operates on them. The model does not know about HTTP. View — a Razor template that turns a model into HTML. Views should contain presentation logic only. Controller — receives the request, calls into the model/services, chooses a result (a view, a redirect, JSON, a status code) and returns it. Why teams chose MVC over Web Forms: No ViewState or server-control lifecycle — the HTML is exactly what you write. Clean separation makes controllers unit-testable without a browser. Friendly URLs through routing. Natural fit for client-side frameworks and REST-style endpoints. ASP.NET Core MVC is the modern version of the same pattern, unified with Web API and Razor Pages on the cross-platform .NET runtime.

What is ASP.NET MVC?

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ASP.NET MVC is a web framework that implements the Model-View-Controller pattern. A controller handles the request, works with the model (the data and business logic), and returns a view (the HTML). It gives you full control over markup, clean separation of concerns and testable controllers, unlike the older Web Forms model.

ASP.NET MVC is a web framework built around the Model-View-Controller pattern. The controller is the entry point for a request — it talks to the model, which is the data and business logic, and then hands a view the model to render as HTML. The main benefits over Web Forms are that you get complete control of the markup with no ViewState, the controllers are easy to unit test because they're just classes returning results, and routing gives you clean URLs. In ASP.NET Core it's the same pattern, just cross-platform and merged with Web API.

The three roles:

Model — the domain objects, view models and the logic that operates on them. The model does not know about HTTP.
View — a Razor template that turns a model into HTML. Views should contain presentation logic only.
Controller — receives the request, calls into the model/services, chooses a result (a view, a redirect, JSON, a status code) and returns it.

Why teams chose MVC over Web Forms:

No ViewState or server-control lifecycle — the HTML is exactly what you write.
Clean separation makes controllers unit-testable without a browser.
Friendly URLs through routing.
Natural fit for client-side frameworks and REST-style endpoints.

ASP.NET Core MVC is the modern version of the same pattern, unified with Web API and Razor Pages on the cross-platform .NET runtime.

C# — a controller action

public class ProductsController : Controller
{
    private readonly IProductService _service;
    public ProductsController(IProductService service) => _service = service;

    // GET /products/5
    public IActionResult Details(int id)
    {
        var product = _service.Find(id);
        if (product is null) return NotFound();
        return View(product);          // -> Views/Products/Details.cshtml
    }
}

Separation of concerns — data, presentation and request handling are distinct
Full control over the rendered HTML (no ViewState, no auto-generated IDs)
Controllers are plain classes, so they unit-test cleanly
Clean, SEO-friendly URLs via routing
Works naturally with JavaScript frameworks and API endpoints

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