Relation: A relation between two sets is simply a way of associating elements from one set to elements of another set. A relation can be represented as a set of ordered pairs, where each pair contains one element from the first set (domain) and one element from the second set (range). For example, if we have: Set A = {1, 2, 3} Set B = {4, 5, 6} A possible relation could be: R = {(1, 4), (2, 5), (3, 6)}