The Relationship is defined as an association among two or more entities. There are three type of relationships in DBMS-
One-To-One: Here one record of any object can be related to one record of another object.
One-To-Many (many-to-one): Here one record of any object can be related to many records of other object and vice versa.
Many-to-many: Here more than one records of an object can be related to n number of records of another object.