ASP.NET is a free, open-source web framework developed by Microsoft for building modern web applications and services. It allows developers to create dynamic websites, web applications, and web APIs using languages like C# or VB.NET.

Unlike traditional ASP, ASP.NET uses the .NET platform, providing a robust, compiled environment. Key advantages include:

• High Performance: Compiled code and early binding make it faster than interpreted scripts.
• Security: Built-in Windows authentication and per-application configuration.
• Rich Toolset: Integrated with Visual Studio for powerful development and debugging.
• Flexibility: Supports MVC (Model-View-Controller) for clean architecture and Web Forms for rapid development.

For hosting, ASP.NET requires a Windows server with IIS (Internet Information Services) and the appropriate .NET runtime installed. Many hosting providers offer specific ASP.NET hosting plans that include these prerequisites. When choosing a plan, ensure it supports your required .NET version (like .NET Core, .NET 5/6/7+, or .NET Framework).

In summary, ASP.NET is a powerful, secure, and scalable framework ideal for building everything from simple websites to complex enterprise applications on the Microsoft stack.