What is the difference between a lookup relationship and a master-detail relationship in Salesforce?

Question

What distinguishes a master-detail relationship from a lookup relationship in Salesforce?

Answer 1

A lookup relationship in Salesforce is a connection between two objects when one item contains a field that refers to the ID of the other entity. Lookup relationships are used to connect two objects, but they have no bearing on how records are shared. A master-detail relationship, on the other hand, involves two items, one of which is the master and the other the detail. Record sharing is impacted by master-detail connections, which also make it possible to generate roll-up summary fields. Additionally, there are more stringent guidelines for data integrity and record deletion in master-detail relationships. 

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