Front-end refers to the part of a website or application that users interact with directly. It includes everything that users see and experience, such as layout, design, and navigation. Front-end development involves using languages like HTML, CSS, and JavaScript to create visually appealing and functional interfaces. Front-end developers focus on ensuring that a website is responsive and works well on various devices, such as smartphones and tablets. They collaborate with UI (User Interface) and UX (User Experience) designers to enhance usability and accessibility, making sure that users have a smooth and enjoyable experience while using the site or application.