YMC has said it perfectly - I too do not use any deplink mods at my deeplinks directory but I do accept unlimited number of deeplinks in unlimited number of categories so, leaving aside the deeplinks mod being used or not in the directory - simply said, a deeplink directory is one which accepts deeplinks within its categories (some would accept multiple deeplinks) - whether they list those deeplinks on a specific page or in individual categories, is the directory owners preference
a questions , semi related perhaps , is there a deeplinks mod for phpld 2.x (free version) , and somehow directories with deeplinks seem ahead of the game