???Cron is a utility that manages background processes or daemons from time to time (for example each minute, day, week or month). Cron works like a scheduler, for example, it can download files from the internet or download emails at regular intervals, also you can use it for more complex tasks like install updates. Originally cron was created for UNIX by Ken Thompson, but now you can use it in all UNIX-like systems, even Linux! UNIX have other utility for tasks scheduling called ???at??? but cron is much better.