Front-end development is the practice of creating the visual and interactive parts of a website or application that users see and interact with directly. It involves using languages like HTML, CSS, and JavaScript to build layouts, design elements, and implement features that enhance user experience. Front-end developers focus on ensuring that websites are responsive, meaning they work well on various devices, such as smartphones, tablets, and desktops. They also collaborate with UI and UX designers to create visually appealing and user-friendly interfaces that meet the needs of the target audience.