The commonly used name for the UNIX daemon that implements a HTTP server. HTTPD listens for requests sent to the TCP/IP port assigned to HTTP.
(HTTP daemon): The daemon (or listener) program that runs on a Web server, listening for and ready to respond to requests for Web documents or CGI based services.
The httpd server is the web server. Web clients, such as browsers like Netscape or Mosaic, send messages to httpd servers on the machine identified in a URL. The return messages from these servers are the data that is displayed to the user.