A fracture is a break in the bone caused by trauma. There are several types of fractures including compound (open) fractures where the bone breaks through the skin, greenstick fractures where one side of the bone breaks and the other side bends, and stress fractures caused by repetitive low impacts rather than a single forceful impact. Compound fractures are serious due to risk of infection, while greenstick fractures commonly occur in children's softer bones and stress fractures typically affect the feet of athletes. Treatment depends on the fracture type but generally involves rest, casting, or surgery to stabilize and heal the broken bone.