A web application is an interactive application program or software that runs on a web server. Unlike desktop or mobile applications that need to be downloaded and installed on the device, web apps can be accessed through a web browser over the internet.
Web apps use a combination of client-side and server-side scripting languages to provide information to the user. The server-side of the web application helps to store and retrieve data while the client-side displays the retrieved data to the users on the front-end.
Some of the common web applications you might have encountered are eCommerce stores, emails, online forms, file conversion, etc.
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