A web application is a software program that runs on a web server and can be accessed through a web browser. Unlike traditional desktop applications, which are installed on a specific device, web applications are available from any device with internet access. This makes them convenient for users, as they can work from anywhere without needing to install software. Web applications often use technologies like HTML, CSS, and JavaScript to create interactive and dynamic user experiences. Examples include online banking systems, social media platforms, and e-commerce sites. These applications rely on a client-server model, where the client is the user's browser and the server hosts the application and its data.