ASP mode, short for Active Server Pages mode, is a programming model used for creating dynamic and interactive web pages. It allows for the integration of server-side scripts, such as ASP or ASP.NET, with HTML to generate dynamic content in real-time. This mode enables developers to create web applications that can respond to user input, access databases, and perform other server-side tasks, making it a powerful tool for building dynamic and data-driven websites. ASP mode is widely used in web development and is supported by most web servers, making it a popular choice for creating dynamic and engaging online experiences.