Work with Active Server Pages
Microsoft Active Server Pages (ASP) is a server-side scripting environment that you can use to create interactive Web pages and build Web applications. When the server receives a request for an ASP file, the server processes server-side scripts in the file to build a Web page that is sent to the browser.
When you publish an ASP file in a virtual directory, there is no loss of functionality. ASP files work normally in an HTTP virtual server directory. ASP files can contain HTML in addition to calls to Component Object Model (COM) components that perform a variety of tasks, such as connecting to a database.
For more information, see the IIS documentation.