Cron jobs are scheduled tasks, which are executed on regular intervals of time set by the user and they also execute scripts coded in different programming languages - PHP, Perl, Bash, and so on. Depending on what actually a cron should do, it can run every single minute, every week or perhaps once a year. There are lots of useful applications to use cron jobs in your day-to-day management of a website. Such as, a backup of the entire website may be generated every day or once per week or an email with all of the fresh signups for the day can be sent to a given e-mail. These types of automated options can make the administration of every website faster and easier. There won't be any particular file types that are allowed or forbidden, so every script can be run by using a cron job.