A simple fracture refers to a type of bone break that does not cause the bone to break through the skin. There are several synonyms for this type of fracture, including a closed fracture, non-displaced fracture, and incomplete fracture. Closed fracture indicates that the skin is not broken, non-displaced fracture indicates that the bone segments are still in their original position, and incomplete fracture indicates that the bone is not completely broken. In contrast, a compound or open fracture refers to a bone break that causes the bone to pierce through the skin. Regardless of the terminology used, any fracture requires prompt medical attention to ensure proper healing and to prevent further damage.