What does it mean when someone designates "Estate Only" as beneficiary of an insurance claim?

Question

what does estate means?

Answer 1

It means that the death benefit will go into the estate when they pass away. The money will not go to a specific person or organization.

Answer 2

Estate means, assets and debts of the dead person.

Effectively, it means the life insurance has to go pay off all the debts of the deceased - including funeral costs and final medical expenses  - and then any money left over gets distributed according to the will, if there is one, or according to state law by a probate judge.