Turtles and tortoises are both reptiles with shells, but there are some key differences between them. Turtles are generally aquatic or semi-aquatic, with webbed feet adapted for swimming. Tortoises, on the other hand, are land-dwelling and have legs with sturdy, elephant-like feet that are adapted for walking on land. Additionally, turtles tend to have flatter, more streamlined shells, while tortoises have dome-shaped shells that are higher and more rounded.