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.

Magento_Enterprise

The Enterprise module switches the store to Enterprise edition by adding a link to Enterprise customer support in Admin Panel, switching notifications from Community to Enterprise-related ones, some small enhancements like displaying “Enterprise Edition” in the bottom of the site, etc.