The Summary fields helps to calculates values that are obtained from the related records, such as those that can be found in a related list.
A roll-up summary field is known to be that field of work that helps one to be able to calculates values that are gotten from related records, such as those seen in a related list.
Note that via this field, one can be able to form a roll-up summary field to show a value in the case of a master record based that is seen on the values of fields found in a detail record.
Note that The detail record need to be associated to the master via a master-detail relationship.
Hence, The Summary fields helps to calculates values that are obtained from the related records, such as those that can be found in a related list.
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