Asp.Net core is a web development platform introduced by Microsoft.  

Asp.Net core consists of a platform for processing HTML requests, frameworks for creating applications, and a secondary utility framework that provide the supporting feature. 

Let's understand in details: 

1) Application framework: 

There is 3 application framework: 

 1. MVC Framework: Model view controller pattern 

 2. Razor pages:  Razor page contain Code and content mixed to form a self-contained page, it's part of MVC 

 3. Blazor: is a new framework in .net core 

2) Utility Framework: 

There are 2 utility frameworks 

1. Identity 

2. Entity Framework 

3) Platform 

Forex. 

1. HTTP server 

2. Middleware 

3. URL Routing

4. Dependency Injection 

5. Configuration & Logging

6. Caching 

7. Model Binding 

8. Razor

9. gRPC

10. SignalR 

First, we need to understand what is Asp.net MVC?

MVC stands for Model-View-Controller, MVC is a design pattern that describes the shape of an application. 

The MVC pattern emphasizes the separation of concerns, where areas of functionality are defined independently.

The controller is working as a mediator and control model and view.  

Early versions of the MVC Framework were built on the ASP.NET foundations that were originally designed for Web Pages,

which led to some awkward features and workarounds. With the move to .NET Core, ASP.NET became ASP.NET Core, 

and the MVC Framework was rebuilt on an open, extensible, and cross-platform foundation.

The MVC Framework remains an important part of ASP.NET Core, but the way it is commonly used has changed with the rise of

single-page applications (SPAs). 

In a SPA, the browser makes a single HTTP request and receives an HTML document that delivers a rich client, 

typically written in a JavaScript client such as Angular or React.