ASP.NET is an open source web framework (released in 2002 as the successor to Classic ASP) for building modern web apps and services with .NET. ASP.NET creates websites based on HTML5, CSS, and JavaScript that are simple, fast, and can scale to millions of users.
Used the world over by individuals, companies, and organizations, this powerful framework has been ranked by some as the most popular web framework in existence.
Organizations have adopted ASP.NET technology to put a web front end on existing business solutions, or to create entirely new web-based applications. Its ability to integrate with the Microsoft Technology Stack allows organizations to leverage the investments they already have in their existing software solutions.