What is a service?
Operating systems use services to start applications on system boot and leave them running in the background. They will also stop the application nicely on system shutdown and automatically restart them if they crash.
The Deluge daemon deluged and Web UI deluge-web can both be run as services.
Most Linux distributions now use systemd. See wikipedia for releases with systemd as default.
- Upstart (Ubuntu 11.04 to 14.10)
- init.d (Obsolete)