The 'Site section' dimension lists the names of site sections on your site. For large sites, it is helpful to group pages into sections. This dimension is useful to see the top-viewed or top-performing site sections.
This dimension is related to the Page and Server dimensions. Page is most granular, Server is least granular, and Site section is between the two.
Dimension values include the names of site sections on your site. Your organization determines what specific dimension values you want to use. Whatever method you use, make sure it is consistent and that you record it in a solution design document .