Web development is the process of building and maintaining websites and web applications. It involves front-end development, which focuses on the visual and interactive aspects using HTML, CSS, and JavaScript, and back-end development, which handles databases, servers, and application logic. Modern web development includes frameworks like Next.js, React, and Bootstrap to enhance functionality and design. Responsive design ensures websites work seamlessly across devices. A well-developed website improves user experience, performance, and accessibility, making it a crucial part of any business or online presence.