ASP (Active Server Pages) on Windows web servers, a system for generating web pages partly or completely by computation, not by launching a separate program as in CGI, but by running scripts interpretively within the web pages as they are delivered to the client.
Thus, a web page can be written partly in VBscript or another programming language in order to do computation as it is being served.
The current version of ASP, using the .NET Framework, is called ASP.NET.
From Microsoft
Microsoft® Active Server Pages (ASP) is a server-side scripting environment that you can use to create and run dynamic, interactive Web server applications. With ASP, you can combine HTML pages, script commands, and COM components to create interactive Web pages and powerful Web-based applications that are easy to develop and modify.
Combine HTML pages, script commands, and COM components to create interactive Web pages and powerful Web-based applications that are easy to develop and modify .