The web interface displays the web page in the window of web browser
Web pages are stored or generated on web servers.
At the request the "browser" communicates with the server and loads contens from the network.

Various web protocols are used for internet communication like HTTP as well as the TCP/IP
The page definition is stored in the so-called markup language HTML
(HyperText Markup Language).

Communication between the browser and the server is bidirectional.
The browser sends "request" to the server.
The server responds with "response" and sends the content to the browser.