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prathap cprathap c 

explain about Junction object?

Junction object?when will we use?If we delete the junction object what will happen?
A junction object is used to make a Many to Many relationship.  This is useful when you have something like an Escalation can be on Many Cases and a Case can have Many Escalations.  Typically you will make it a M-D relationship between join object and the parent object.  So nothing would happen if you delete the junction object, but it would be removed if you deleted either of the parents.