ASP, or Active Server Pages, is a server-side scripting language used for creating dynamic and interactive web pages. It allows for the integration of HTML, CSS, and JavaScript to create dynamic content that can be personalized for each user. ASP is commonly used for developing e-commerce websites, online forms, and database-driven applications. It offers a powerful and flexible platform for building dynamic websites, making it a popular choice among web developers. With ASP, websites can be customized and updated in real-time, providing a seamless and engaging user experience.