Web development is the process of building, creating, and maintaining websites and web applications that run online via a browser. It spans everything from front-end design—using code like HTML, CSS, and JavaScript to construct visual layouts and interactive user interfaces—to back-end infrastructure, which manages databases, server logic, dynamic content, and network security. By blending aesthetic design with functional programming and responsive performance, web development transforms digital ideas into accessible, secure, and user-friendly online experiences across desktop and mobile devices.