Introduction to Asp.Net

Well, let's start with Definition first. If you go to MSDN you will find definition as:

ASP.NET is a unified Web development model that includes the services necessary for you to build enterprise-class Web applications with a minimum of coding. ASP.NET is part of the .NET Framework, and when coding ASP.NET applications you have access to classes in the .NET Framework. You can code your applications in any language compatible  with the common language runtime (CLR), including Microsoft Visual Basic and C#. These languages enable you to develop ASP.NET applications that benefit from the common language runtime, type safety, inheritance, and so on.

But the most simple definition is given by wikipedia as:

ASP.NET is an open-source server-side Web application framework designed for Web development to produce dynamic Web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services.

I will discuss various difficult term given in MSDN definition later.

What is webapplication?

A web application is an application that is accessed through a web browser. 

Examples of web browsers include Mozilla,Chrome,Opera,Safari and many more.

Now lets go into detail of web application:

 1- Web application works on client server architecture. 

 2- Client is our browser and server is IIS(Internet Information 

  Services).Every web application runs under microsoft IIS.

 3- Since our browser can only understand HTML and not aspx page so it is the 

  responsibility of IIS to generate HTML from aspx document and send it back. 

 4- Web application needs to be installed on one server and we can access them on every computer 

  with just a browser by specify the URL in browser window.

 5- It can be available over different browsers.

 6- It is accessible from any where if internet is available.