What is the use of Junction Object in Salesforce?

In Salesforce, a Junction Object is a custom object with two master-detail relationships to two different record types. It is used to represent a many-to-many relationship in which several junction objects can link one instance of a record to many children, and each child can equally be linked to many parents.

Hi satyakam,

Instead of creating a relationship field on the Position object that directly links to the Employment Website object, we can link them using a junction object . A junction object is a custom object with two master-detail relationships, and is the key to making a many-to-many relationship.

Thanks

Hi,

Junction Object is a custom object with two master-detail relationships. Using a custom junction object, you can model a “many-to-many” relationship between two objects. For example, you create a custom object called “Bug” that relates to the standard case object such that a bug could be related to multiple cases and a case could also be related to multiple bugs.

Creating the many-to-many relationship consists of:

Creating the junction object.
Creating the two master-detail relationships.
Customizing the related lists on the page layouts of the two master objects.
Customizing reports to maximize the effectiveness of the many-to-many relationship.

Thanks.

Junction objects are used for creating many-to-many relationships in Salesforce. Salesforce by default supports one-to-many relationships.