What do Group By fields define in a Pivot report?

Group By fields in a Pivot report are crucial for organizing and summarizing data. They define how the data will be grouped and categorized in the report, which is typically represented on the horizontal axis. This allows for a consolidated view of data, letting users analyze trends and patterns across different categories or dimensions within the dataset.

When you use Group By fields, you're essentially organizing the underlying data into distinct segments, which can be shown across the top of the pivot table or report. This categorization is vital for performing aggregations, calculations, and comparisons between different groups of data, making it easier to derive insights.

The other options don't align with the function of Group By fields. For example, the vertical axis typically represents values or measurements that are being analyzed, while the total number of records pertains to the overall count of entries in the dataset without relevant categorization. Likewise, filter conditions are utilized to narrow down the data that is being analyzed but do not define how it is structured in terms of grouping.