The natural minor scale is also known as the Pure Minor or Aeolian scale.
It's used in Western classical music, rock, jazz, latin and provide a darker more complex sound than major scale. The natural minor has a more sad sound compared to the happier sound of the major scale.
Santana's songs "Europa" and "Moon Flower" are examples based on this scale.
Here are the fingerings of natural minor scales in all 12 keys.