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Classic ASP(Active Server Pages)

ASP (aka Classic ASP) was introduced in 1998 as Microsoft's first server side scripting language.

Classic ASP pages have the file extension .asp and are normally written in VBScript.

ASP.NET was released in 2002 as a successor to Classic ASP.

ASP.NET pages have the extension .aspx and are normally written in C# (C sharp).

ASP.NET 4.6 is the latest official version of ASP.NET.

ASP.NET 5 was expected to be an important redesign of ASP.NET.

However, the development of ASP.NET 5 was stopped in favor of ASP.NET Core.

ASP.NET Web Pages

ASP.NET Web Pages is an SPA application model (Single Page Application).

The SPA model is quite similar to PHP and Classic ASP.

ASP.NET Web Pages is being merged into the new ASP.NET Core.