Web application development involves the creation and maintenance of software applications that operate on web browsers. Developers use various technologies, including HTML, CSS, and JavaScript, to design interactive and responsive user interfaces. Back-end technologies such as server-side scripting, databases, and server management ensure data processing and storage. Frameworks like React, Angular, and Vue.js enhance front-end development, while server-side frameworks like Django, Ruby on Rails, or Node.js handle back-end logic. Security measures, performance optimization, and cross-browser compatibility are crucial considerations. Continuous testing, debugging, and updates contribute to the ongoing improvement of web applications, ensuring a seamless and efficient user experience across various devices.