A web application is typically built on the request and response parameter paradigm, which means that whenever a request is sent to the server, the data is returned as a response parameter, but the server never transmits the data to the client on its own. The server always awaits the client's or browser's request before sending the data in JSON format. Between the server and the client, there is only one method of communication, and the server must constantly rely on the client to transmit data.