Difference between Lookup and Master-Detail relationship in Salesforce

Difference between Lookup and Master-Detail relationship in Salesforce


Lookup
Master-Detail
Loosely
coupled.     
Tightly
coupled.
Parent
is not a required field while creating child record.          
Parent
is a required field while creating child record.
We
cannot create roll-up summary field.
We
can create roll-up summary field.
No
cascade delete. 
Cascade
delete.

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