Magento 2 uses three cron groups — default, index, and consumers — to organize its scheduled tasks. The built-in default cron jobs cover a wide range of store operations, including:

• Catalog reindexing - keeps product and search data up to date
• Transactional & newsletter emails - order confirmations, alerts, and subscriptions
• Currency rate updates - auto-refreshes exchange rates
• Sitemap generation - creates and updates XML sitemaps for SEO
• Catalog price rules - applies scheduled pricing changes
• Customer notifications & alerts - back-in-stock and price-drop alerts
• Session and log cleanup - removes expired data from the database

You can view the full list of cron jobs registered in your store by logging into the Magento database and running: SELECT job_code FROM cron_schedule GROUP BY job_code;