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Web application

A web application is an application that is accessed over machine boundary. In the narrow sense, the term always mean an application developed over World Wide Web depending on HTTP protocol applying the client-server model. The client always indicates a web browser, while the server always indicates a web server which responds to the HTTP request. The web application is popular due to the ubiquity of web browsers. Also the ability of maintaining and updating the application without distributing and installing softwares on potentially thousands of client computers, which implies the cross-platform compatibility, is another key reason for the popularity.