A relationship that has a cardinality constraint of one or more is an mandatory relationship.
When anything is counted, the number that results is referred to as its cardinality. As a result, a set's cardinality is equal to the number of its elements. For instance, the set {1, 2, 3, 4, 5} has a higher cardinality of five than the set {1, 2, 3} which has a cardinality of three.
A constraint that limits the number of elements in a set is called a cardinality constraint. For instance, if C is a group of computers and D is a group of disc drives, we might insist that C as a whole be compliant.
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