Intersection finds elements present in both sets: python a = {1, 2, 3} b = {2, 3, 4} common = a & b # {2, 3} common = a.intersection(b) # Same result Think of intersection as "only elements in both sets." If set A is people who like pizza and set B is people who like pasta, the intersection is people who like both.
Empty intersection means the sets have no elements in common.