User testing plays a vital role in web development by providing insights into the user experience (UX) and usability of a website. By observing real users as they interact with the site, developers can identify pain points, navigate challenges, and gather feedback on design elements. This process helps pinpoint areas for improvement, ensuring the final product meets user needs and expectations. Furthermore, user testing fosters a user-centric approach, promoting engagement and satisfaction. By iterating based on feedback, developers can enhance functionality and streamline navigation, ultimately leading to better results.