Site Columns

Columns, also known as metadata or properties, are information that is attached to SharePoint content. A column represents an attribute, or piece of metadata that is manageable for a list or content type. Site columns are columns that are created at the site level as templates to be reused repeatedly as needed. Site columns created at the top-level site of the site collection are available for use throughout the site collection. Site columns save time through reusability and provide uniform results through consistency.

There are numerous types of site columns to choose from. Each type has its own settings and functionality. When you create a site column select the type that best suits the function for which it is being created.