ASP.NET is a Microsoft Technology and it is server side scripting language of Microsoft. It is a program that runs inside IIS and IIS comes as a free component with Windows servers.

ASP.NET also part of Window 2000 and XP Professional. When a browser requests an HTML file to the server, the server will return that file. When a browser requests an ASP.NET file, IIS passes the request to the ASP.NET engine on the server. And Finally, the ASP.NET file is returned to the browser as plain HTML An ASP.NET file is just same as an HTML file

One of the most important goals of .NET was to permit developers to write an ASP.NET application using multiple programming languages. As long as each ASP.NET page contains programming language, you can mix & match different pages using different languages & they will work together seamlessly.

Advantages Of Asp.net Development

High speed of development

Increased productivity

Availability of cross-platform migration

Reliability

Security

Access to the opportunities of .NET Framework Library

Easy configurations of applications and security.