Magento Cron is a built-in task scheduling system that runs background operations automatically at defined intervals. Magento cron jobs are server-scheduled tasks that execute repetitive operations automatically rather than requiring you to run them manually including indexing, caching, sitemap generation, and currency rate updates. A single cron job entry is defined in the server's crontab file, which Magento reads every minute to discover and execute pending tasks registered across all modules via their crontab.xml files. Without a properly running cron, critical store functions like order emails, price rules, and search indexing will fail silently.