Active Server Pages (ASP) is Microsoft's server-side technology for dynamically-generated web pages that is marketed as an add-on to Internet Information Services (IIS).
Programming ASP websites is made easier by various built-in objects. Each object corresponds to a group of frequently-used functionality useful for creating dynamic web pages. In ASP 3.0 there are six such built-in objects: Application, ASPError, Request, Response, Server and Session. Session, for example, is a cookie-based session object that maintains variables from page to page. Application Center Test is also available for load testing.
Most ASP pages are written in VBScript, but any other Active Scripting engine can be selected instead by using the @Language directive. JScript (Microsoft's implementation of ECMAScript) is the other language that is usually available. PerlScript (Perl) and others are available as third-party installable Active Scripting engines.
From
http://en.wikipedia.org/wiki/Active_Server_Pages