Active Server Pages (ASP), also known as Classic ASP or ASP Classic, is Microsoft’s first server-side script engine for dynamically-generated web pages. It is a Microsoft technology and program running inside IIS.
In ASP 2.0 there are six built-in objects: Application, ASP Error, Request, Response, Server, and Session. Web pages with the .asp file extension use ASP, although some Web sites disguise their choice of scripting language for security purposes.
An ASP file is a source code script file commonly used by internet pages. It is used to generate dynamic content and dynamically made web pages and helps provide information that Internet browsers will read and interpret.