A product can be in many different orders.Also,each order can have many products in inventory.This is an example of a M:N relationship.

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A M:N relationship means that one entity can be related to many entities of another type, and vice versa. In this case, a product (one entity) can be in many different orders (related to many entities of another type), and each order can have many products in inventory (related to many entities of the first type).

A Product Can Be in Many Different Orders