This type of category lists sites for holiday accommodation with full kitchen facilities, rented by the day, week or month.  The guests are expected to provide their own meals.
Note that these facilities offered within a caravan park are found in the Travel and Tourism: Camping and Caravans type category.
However, this category links only to those localities within the Dartmoor National Park, that have so many sites that a sub-division of Accommodation to Self Catering category is warranted.  Since this is very rare, users are advised to choose the locality @linked from the main Dartmoor page.