What are examples of union set?

A union set combines all the elements from two or more sets, without duplicates. For example, if Set A = {1, 2, 3} and Set B = {3, 4, 5}, the union set A ∪ B = {1, 2, 3, 4, 5}. Another example is if Set C = {a, b} and Set D = {b, c, d}, the union set C ∪ D = {a, b, c, d}.