A site column is a reusable column definition, or template, that you can assign to multiple lists across multiple SharePoint sites. Site columns decrease re-work and help you ensure consistency of metadata across sites and lists. For example, suppose you define a site column named Customer. Users can add that column to their lists, and reference it in their content types. This ensures that the column has the same attributes, at least to start with, wherever it appears. Much like site content types, you define a site column at the site level, independent of any actual list or content type.
When you add a column to a list, SharePoint Foundation copies the site column locally onto the list as a list column. You can then make changes to the list column; these changes apply only to the column as it behaves on that list.
You can also create your own list columns, directly on a list. Either way, list columns apply only to the list to which you add them; they cannot be added to multiple lists.
When you add a column to a list, SharePoint Foundation copies the site column locally onto the list as a list column. You can then make changes to the list column; these changes apply only to the column as it behaves on that list.
You can also create your own list columns, directly on a list. Either way, list columns apply only to the list to which you add them; they cannot be added to multiple lists.
