what are the jobs for on ec2 bitnami drupal

I found many jobs on ec2 bitnami drupal. they are below.

17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#
11 * * * * bitnami cd /opt/bitnami/stats && ./agent.bin --run -D

what are these jobs for?

thanks.