A Data Table is a particular Excel functionality that creates a table of sensitivity results in an automated fashion i.e. by running the model several times, as the input(s) take a set of values that one has pre-defined. (The term “data table” is slightly misleading, since it is not a table of data, but of calculations).
The functionality is found on Excel’s Data tab, under the What-If Analysis sub-menu, with a drop-down that includes the Data Table as an option.