Active Server Pages (ASP) is a technology developed by Microsoft that allows for the creation of dynamic web pages. ASP code is written within HTML pages and is executed on the server, with the output being standard HTML sent to the browser. This allows web pages to incorporate server-side scripting for functionality like dynamically updating content and connecting to databases. The document discusses the key differences between static and dynamic web pages, and provides examples of using common ASP objects and components like Request, Response, Session, and Server to handle tasks like form submission, setting cookies and headers, and managing user sessions.