What is a CronJob?

The concept CronJob originally comes from the UNIX world. A CronJob is a task, which the PC handles independent and automatically without any influence of a user, in periodical time intervals. The tasks a well as the time intervals, in which they should be done, will store in a table. The so called CronTab.

 

For example:
You want to send a neswletter to your custumers on every sunday evening. Now you have a problem! Because nobody is working in your firm on sunday evening. Here you can use the CronJobs. You must say only what he has to do and when he has to do this, then he execute this task automatically.