Can someone define data aggregation and explain how it works? or What does it mean to define data agg

To define data aggregation, imagine you’re a teacher with 100 test scores. Instead of listing all, you say "avg score = 85." That’s aggregation.

Works by grouping (by student, class, etc.) and calculating. Tools: R, Excel, or QuickSight.

Why care? Because nobody makes decisions from raw spreadsheets—aggregation gives the "aha" moments.