Magento Open Source (OSL 3.0) is the free community version. It includes the full catalogue, checkout, payment and shipping framework but lacks B2B features, Page Builder, customer segmentation, AI-powered recommendations and Adobe's support. Adobe Commerce is the paid enterprise version (cloud or on-premise) that adds all of the above plus Adobe's ecosystem integrations (Target, Analytics, Experience Manager). For most SMB and mid-market projects, Magento Open Source with extensions covers the requirements. Adobe Commerce is justified when you need its B2B suite or Adobe ecosystem integration.