Classic ASP, also commonly referred to as 'ASP' is a server-side scripting environment used to create and run dynamic web applications. With ASP, it is possible to combine HTML pages, script commands, and COM components to create interactive web pages that are easy to develop and modify. Classic ASP is the predecessor to Microsoft's ASP.NET, but it is still in wide use today. As of this writing, a filetype search on Google reports over half a billion classic asp web pages. Due that the .asp file extension is often masked by url-rewrite functions and most often used in the development of for server-side logic (the back-end of websites) versus public facing, it is presumed that several billion webpages still rely on Classic ASP.