A daemon (pronounced DEE-muhn) is a program that runs continuously and
exists for the purpose of handling periodic service requests that a computer system expects to
receive. The daemon program forwards the requests to other programs (or processes) as appropriate.
Each server of pages on the Web has an HTTPD or Hypertext Transfer Protocol daemon that
continually waits for requests to come in from Web clients and their users.
In mythology, a daemon, according to Webster's, was "an attendant power or spirit."
Daemon can be confused with demon, which has a
different but similar meaning. The New Hacker's Dictionary says that a daemon is a program
that runs by itself directly under the operating system whereas a demon is part of a larger
application program.
This was last updated in September 2005
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