A web developer is a skilled professional responsible for designing, building, and maintaining websites and web applications. They work with programming languages like HTML, CSS, and JavaScript for front-end development and may use frameworks like React or Angular. Back-end developers manage server-side logic, databases, and APIs using technologies like Node.js, Python, or PHP. Full-stack developers handle both front-end and back-end tasks. Web developers ensure websites are responsive, user-friendly, and optimized for performance. They collaborate with designers, project managers, and clients to deliver functional and visually appealing digital solutions while staying updated with emerging web technologies and best practices.