What is ASP.NET

ASP.NET is a Web application framework developed by Microsoft to build dynamic data driven Web applications and Web services. using HTML, CSS and JavaScript. Moreover, it is a technology for developing, deploying, and running Web applications. ASP.NET is a part of the Microsoft .NET Framework, so all .NET Framework features are available to ASP.NET applications. That means, when you developing ASP.NET applications you have access to classes in the .NET Framework because .NET framework is a collection of classes and ASP.NET is the successor to classic ASP (Active Server Pages).

ASP.NET introduces entirely a new object-oriented execution model. In order to overcome the limitations of ASP (Active Server Pages) , Microsoft has developed a new technology called Microsoft ASP.NET 

ASP.NET is built on the Common Language Runtime (CLR), allowing programmers to write ASP.NET code using any supported .NET languages like VB.NET and C#. Unlike the ASP runtime, ASP.NET uses the Common Language Runtime (CLR) provided by the .NET Framework. The Microsoft .NET Platform provides all of the tools and technologies that are needed to build distributed Web applications. ASP.NET is integrated with Visual Studio .NET, which provides a GUI designer, a rich toolbox, and a fully integrated debugger. In ASP.NET, you can write the HTML code in the .aspx file and the code for programming logic in the code-behind file (.aspx.vb or .aspx.cs ). Also ASP.NET introduces two sets of controls, the HTML controls and the Web controls, which are collectively known as "server controls."

What is a Web Application?
A web application is an application that is accessed by users using a web browser. Examples of web browsers include 
1. Microsoft Internet Explorer
2. Google Chrome
3. Mozilla FireFox
4. Apple Safari
5. Netscape Navigator