Final answer:
A simple fracture is the type of fracture that is clean and does not penetrate the skin.
Step-by-step explanation:
The type of fracture that is clean and doesn't penetrate the skin is known as a simple fracture. Simple fractures, also referred to as closed fractures, occur when the bone breaks but there is no open wound in the skin. This is in contrast to a compound fracture, where the bone breaks and pierces through the skin, posing a greater risk of infection and requiring more intensive treatment.