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suresh hn 1suresh hn 1 

Roll up summer

how to use roll up summery
Krishna Prasad Salem NarasimhanKrishna Prasad Salem Narasimhan
Rollup summary can be used only if there are Master-Detail relationship and it can be created only on Parent object. For example, if there is a Master Detail relationship field on Review object related to Job Application object, then you can create Rollup summary field on Job Application object because it is Parent object.
Dutta SouravDutta Sourav
Here it is well explained:
https://developer.salesforce.com/trailhead/en/point_click_business_logic/roll_up_summary_fields
Rakesh51Rakesh51
While your formula fields calculate values using fields within a single record, roll-up summary fields calculate values from a set of related records, such as those in a related list. You can create roll-up summary fields that automatically display a value on a master record based on the values of records in a detail record. These detail records must be directly related to the master through a master-detail relationship.
refer this page, to study more about the roll up fields.
The Roll up Summary field is basically of 4 types:
Count
Sum
Min
Max

Note : Roll up summary field can only be defined on the master object.