What tool pivots the orientation of a data table from horizontal to vertical?

The Transpose tool is specifically designed to change the orientation of the data table from horizontal to vertical. When using the Transpose tool, individual columns of data become rows, and the values are reorganized to reflect this new vertical structure. This function is particularly useful when you need to prepare data for analysis or visualization where a vertical orientation might be required for better readability or when certain processing functions can only be performed on vertical data.

The functionality of the Transpose tool allows users to specify which columns should be treated as headers and which should become row values, making it versatile for various data transformations. This is essential in scenarios like data reshaping for reporting or integrating with other tools that may require a specific data format.

While the other tools mentioned have their own distinct purposes—Union combines datasets with identical structures, Cross Tab summarizes data into a matrix format typically used for pivoting aggregated results, and Append Fields adds new fields to a data table without changing its orientation—they do not perform the specific task of transposing data from horizontal to vertical.