To enable and run cron in Magento, follow the below mentioned steps. It varies according to Magneto versions.

MAGENTO 1.X: Use the syntax

sh /path/to/your/magento/site/root/cron.sh

MAGENTO 2.X: Use the syntax

php /path/to/your/magento/site/root/bin/magento -- --quiet cron:run

BY Best Interview Question ON 03 Mar 2019