Daemons work for you

A daemon is a computer program that runs in the background, rather than under the direct control of a user;

Systems often start (or “launch”) daemons at boot time: they often serve the function of responding to network requests, hardware activity, or other programs by performing some task. Daemons can also configure hardware (like devfsd on some Linux systems), run scheduled tasks (like cron), and perform a variety of other tasks.