Web application development refers to the process of building interactive software applications that run on web browsers. Unlike traditional desktop applications, web apps are accessed via the internet and can be used on various devices. This development involves both front-end and back-end components. Front-end refers to the user interface and design, while the back-end focuses on servers, databases, and application logic. Technologies like HTML, CSS, JavaScript, and frameworks such as React, Angular, and Node.js are commonly used. Web application development ensures scalability, security, and seamless user experience, making it essential for businesses and services in the digital age.