The Magento 2.3.1 includes a Page Builder Content editing tool, developer and security updates, inventory and performance enhancements, and much more!
Features of Magento 2.3.1:
~ Page Builder tool in Magento Commerce edition
~ Improved Order Creation from the admin pane
l~ Inventory Management with Elastic Search 6.0
~ Progressive Web App Apps Studio
~ B2B enhancements
~ Includes GraphQL
~ Magento Shipping Improvements
~ Security patch PRODSECBUG-2198 for the SQL injection vulnerability
~ Cart and Checkout Enhancements
For more info: https://meetanshi.com/blog/magento-2-3-1-release/