All-purpose flour typically refers to refined wheat flours that have been enriched and may or may not be bleached. All purpose flours have a mid-range gluten content and often contain dough conditioners. See: Wheat flour, Wheat flour enrichment, Wheat flour bleaching
All-purpose flour, being refined, lacks the fiber and a number of micronutrients present in whole grain wheat and whole wheat flour. See: Wheat flour, whole wheat; Wheat, Wheat flour enrichment, Wheat flour bleaching, Gluten
Wheat flour is unsuitable for individuals sensitive to gluten.
Wheat flour, plain; Wheat flour, white