Alternative form of demon.
"The system administrator restarted the web server daemon to apply security updates without interrupting user sessions."
A process (a running program) that does not have a controlling terminal.
In plain English: A daemon is a background program that runs on your computer to handle tasks without you needing to interact with it directly.
"The computer daemon started up automatically when I turned on my laptop."
Usage: In computing, use the lowercase form "daemon" to refer to background processes without terminals, while reserving capitalized names like "Damon" for proper nouns or mythical figures. Avoid confusing this technical term with similar-sounding words unless specifically discussing software architecture.
The word daemon comes from the Latin term daemon, which itself was borrowed from the Ancient Greek daimon. Originally meaning a tutelary deity or dispenser of fate, it entered English with this spiritual sense intact.