Answer :
Many to many (M:M) entity relationships, exist when one entity can be related to more than one other and those entities can be related to multiple entities of the same type as the original entity is true.
What is M to M relationship?
In an entity relational diagram, a many-to-many relationship is a sort of cardinality that describes a connection between two entities (between two tables in a database). The connection between the entity's student and the course would be a straightforward illustration.
A many-to-many relationship develops when numerous records in one table are linked to several records in another table. For instance, there is a many-to-many link between consumers and products: customers can buy different things, and many customers can buy different products. The following advice is offered if you have a many-to-many link between dimension-type tables: Make sure each many-to-many connected entity has an ID field by adding it as a model table.
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