ASP (Active Server Pages) is a form of CGI scripting on a web server. ASP resides as a number of .DLL files that are installed with Microsoft Internet Information Server (IIS) 2.0 and greater. The ASP parsers are also installed with Microsoft Personal Web Server.
For those using Unix operating systems, ChilliSoft makes an ASP interpreter that works with Netscape's HTTP server as well as Apache.
Alternatives to ASP include ColdFusion, Perl and standard CGI programming or PHP.
In order to start using ASP you need to install IIS or PWS.