A many-to-many relationship exists when a book has multiple authors and the authors have written many different books is true.
A relationship refers to an association between two or more entities. Three types of relationships: one-to-one relationship (1:1), one-to-many relationship (1:M), and many-to-many relationship (M:N or M:M). A many-to-many relationship exists when one or more items in one table or group have the possibility of having a relationship to one or more items in another table or group. For example, for one instance of entity A, there exists zero, one, or many instances of entity B; and for one instance of entity B, there exists zero, one, or many instances of entity A. Hence, a many-to-many relationship exists when a book has multiple authors and the authors have written many different books is true.
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