Active Server Pages (ASP) is a server-side scripting technology that allows developers to create dynamic web pages using HTML, scripts, and reusable ActiveX components. ASP enables scripting on IIS servers using VBScript or JScript to build complex pages that interact with databases and other server objects, running processing logic on the server and only sending results to clients for browser independence. It provides an easy way to create dynamic web applications using built-in and third-party server components without requiring scripting capabilities in browsers.