Adobe Commerce is Adobe's flagship commerce solution. As such, Adobe spends a lot of time building new functionality for the platform and new integration opportunities with other Adobe products.
Adobe Commerce is available via paid license for either the Adobe hosted version which is called Adobe Commerce Cloud, and the unhosted version which is simply Adobe Commerce. Adobe provides some basic support with the paid license including core updates and security patches.
Even with the Adobe support, businesses on the Adobe Commerce platform will need their own development resource for ongoing maintenance.