Cron jobs are timetabled tasks, which are executed on regular time intervals pre-set by the end user and they execute scripts developed in different programming languages - PHP, Perl, Bash, and so on. Depending on what actually a cron has to do, it can run every single minute, once a week or even each year. There're plenty of handy applications to use cron jobs in your day-to-day management of a site. Such as, a backup of the entire site can be generated once a day or maybe once a week or an email message with all of the fresh signups for the day may be delivered to a particular email address. This kind of automatic options can make the administration of any site faster and easier. There are no particular file types that are allowed or forbidden, so any script can be executed with a cron job.