Final answer:
Master-Detail relationships in Salesforce are closely linked parent-child connections with cascade delete and shared security settings, unlike Lookup relationships which allow for more independent security settings and do not cascade delete when the parent record is deleted.
Step-by-step explanation:
Difference Between Master-Detail and Lookup Relationships in Salesforce
The key differences between a Master-Detail relationship and a Lookup relationship in Salesforce revolve around features like record ownership, deletion behavior, and security settings. A Master-Detail relationship is a parent-child relationship in which the master (parent) controls certain behaviors of the detail (child) record. For example, deleting the master record also deletes all related detail records, and security settings on the master record cascade to the detail records.
On the other hand, in a Lookup relationship, the related records are more loosely connected. Deleting the parent record in a lookup relationship does not lead to automatic deletion of the child records. Additionally, each record in a lookup relationship can have its own independent security settings. Lookup relationships give a more flexible connection between objects that do not need the strict dependency found in master-detail relationships.