Frontend developers create the visual and interactive aspects of websites and applications. They need expertise in HTML for structuring content, CSS for styling, and JavaScript for interactivity. Knowledge of frameworks/libraries like React or Angular is common. They ensure responsiveness for various devices, optimize performance, and handle cross-browser compatibility. Proficiency in version control (e.g., Git), debugging, and testing is crucial. Basic design skills aid collaboration with designers. Continuous learning is essential due to the rapidly evolving nature of frontend development.