Cron Jobs (Cron, Cron Tabs) is the special tool on the server that helps to initiate different processes on schedule. For example, cache clearing every hour, database backup every night, etc. These commands are set up in the special table on the server or in the cpanel in the established format.
The developers of CS-Cart use Cron jobs actively to automate the add-on functionality. For example, one of our add-ons uses Cron command to send the reminders to the customers with the abandoned carts and to the customers with the placed orders with the offer to leave a review about purchased products.