Web application development is the process of creating interactive software applications that run on a web server and are accessible through a web browser. Unlike traditional desktop applications, web apps are stored on remote servers and can be used by anyone with internet access, allowing for seamless connectivity, real-time data processing, and cross-platform compatibility. This process involves various stages, including planning, designing, coding, testing, and deployment, often utilizing modern frameworks like React, Angular, and Vue.js, along with server-side technologies such as Node.js, Django, and Ruby on Rails. Web application development is popular for its scalability, as it enables businesses to build user-centric, cost-effective solutions that cater to a global audience, enhancing customer engagement, accessibility, and operational efficiency.