Historically, a number of services are being provided by the Internet: Telnet, FTP, and E-Mail. New services have been made available on the Internet, with the World Wide Web gaining much attention. We will describe some of these services in the next sections.
Most of the Internet services operates in a Client-Server model. This simply means that software typically is installed on the user's computer system (the Client) accesses information or other applications located on another computer (the Server) over a network. Servers typically are strategically located computer systems (either a local computer system or one located anywhere on the network) whose task is to provide information and services to the client. The World Wide Web is an example of a client-server system; a browser such as Mosaic or Netscape is running on your system and communicates with the many types of servers on the Web. These servers can include HTTP servers, FTP servers, WAIS servers, etc., which run on remote machines and serve information to the client.
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