SIMULATION - Describe the difference between a lookup and a master-detail relationship? 

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Lookup: Creates a relationship that links this object to another object. The relationship field allows users to click on a lookup icon to select a value from a popup list. The other object is the source of the values in the list Master-detail: Creates a special type of parent-child relationship between this object (the child, or "detail") and another object (the parent, or "master").