SharePoint Foundation is the platform for all on-premises products in the SharePoint family. Questions having this tag should be specific to SharePoint Foundation and not SharePoint Online or other license SKUs of SharePoint Server. It contains all of the core functionality and architecture drawn on by the commercial versions of the package, but is free to download
Microsoft SharePoint Foundation is the platform for all products in the SharePoint family. It contains all of the core functionality and architecture drawn on by the commercial versions of the package. SharePoint Foundation is available for download at no cost.
Questions having the tag sharepoint-foundation should be specific to SharePoint Foundation and not any other SKU.
Reference: Wikipedia - Microsoft SharePoint
