What is difference between lookup and master details relationship in Salesforce?

Question

Accepted Answer

Lookup relationship is loosely coupled while master-detail relationship is tightly coupled in Salesforce.

Lookup relationship does not impact the deletion of related records, while master-detail relationship does.
In lookup relationship, child records do not inherit the security and sharing settings of the parent record, while in master-detail relationship they do.
Lookup relationship can be set to optional, while master-detail relationship is always required.
An example of lookup relationship is Account and Contact, where a Contact can be related to multiple Accounts.
An example of master-detail relationship is Account and Opportunity, where an Opportunity is always tied to a specific Account.

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