Is user cron job running in background?

Hi,
Should the user jobs specified in crontab be running in background?
Cron daemon is already running in background. So I am not sure
whether should the jobs (output and error messages are redirected to file)
ran by it be explicitly stated to be run in background (& at end of command)
if one wants to or automatically ran in background by cron.

Thanks.

every job listed in cron automatically runs in the background..So no need to do anything for it