Mapping Cardinality identifies the number of entities in one entity set, which can be connected with the number of entities of other set through relationship set.
1. One-to-one: One entity from entity set A can be connected with at most one entity of entity set B and vice versa.
2. One-to-many: One entity from entity set A can be related with more than one entities of entity set B, though an entity from entity set B can be connected with at most one entity.
3. Many-to-one: More than one entities from entity set A can be connected with at most one entity of entity set B, but an entity from entity set B can be related with more than one entity from entity set A.
4. Many-to-many: One entity from A can be linked with more than one entity from B and vice versa.
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