An HTTP Daemon, often referred to as an HTTP server, is a software application that handles requests from clients, typically web browsers. It listens for incoming requests on a specific port, usually port 80 for unencrypted traffic and port 443 for encrypted traffic. When a request is received, the daemon processes it and sends back the appropriate response, such as a web page or an error message. These daemons are essential for the functioning of the World Wide Web, as they enable the transfer of data between servers and clients. Popular examples of HTTP daemons include Apache, Nginx, and Microsoft IIS. Each of these servers has its own features and configurations, catering to different needs and environments.