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.
“ASP.NET is built on the .NET framework, which provides an application program interface (API) for web developers. “
ASP.NET supports three different development models:
Single Page Applications(Similar to PHP and classic ASP with HTML)
MVC (Model View Controller)
Web Forms (Event Driven Model)