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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

Cron

Cron is a module that enables scheduling of jobs. Other modules can add cron jobs by including crontab.xml in their etc directory. The command “bin/magento cron:run” should be run periodically to trigger the Cron module to run its scheduled jobs. This module also allows administrators to tune cron options in Magento Admin.