Active Server Pages (ASP), later known as Classic ASP or ASP Classic, is Microsoft’s first server-side script engine for dynamically generated web pages. ASP.NET, first released in January 2002, has superseded ASP.
ASP uses server-side scripting to generate content that is sent to the client’s web browser. The ASP interpreter reads and executes all script code between <% and %> tags, the result of which is content generation. These scripts were written using VBScript, JScript, or PerlScript.