1, union: a set consisting of a and b.

2. Intersection: a set consisting of all elements belonging to set A and set B. ..

Second, the expression is different.

1, union: recorded as A∪B, pronounced as a and b.

2. Intersection: marked as A∩B, pronounced as "intersection of A and B".

Third, the characteristics are different.

1, union: union operation integrates any power into Boolean algebra. ?

2. Intersection: the number 9 does not belong to prime set {2, 3, 5, 7, 1 1, ...} and odd set {1, 3, 5, 7, 9,1,...