An developer designs and builds web pages using the markup language. They structure the content and layout of a web page, integrating graphics, animation, text, and other elements. They also ensure that the website is compatible across various browsers and platforms. developers collaborate with designers and developers to implement user interface features, optimize web pages for speed and scalability, and ensure that the website adheres to SEO standards. They also debug issues, maintain the quality of the website, and update it as needed. Their role is crucial in creating a user-friendly and visually appealing online presence.