HTML, CSS, and JavaScript each play an important role in web design. HTML is the backbone of a webpage, providing the structure and content such as headings, paragraphs, and links. CSS works alongside HTML by controlling the layout, colors, and overall appearance of the site, making it visually appealing and user-friendly. JavaScript adds interactivity and dynamic functionality, such as forms, animations, and interactive menus. Toghether, HTML and CSS are mainly used on the front-end, while JavaScript can support both front-end and back-end tasks, ensuring a complete and engaging user experience.