What is the function of parameters in Tableau?

Parameters in Tableau serve as dynamic placeholders that allow users to replace constant values used in calculations or filters. They enable interactive features by allowing users to input or select a value which can then be reflected in various aspects of the visualizations. For example, a parameter might be used to let users choose a variable such as a sales target or region, which then adjusts the underlying calculations and displayed metrics accordingly.

This functionality is particularly powerful because it offers flexibility and interactivity, allowing users to explore different scenarios or perspectives within the same dashboard without the need to re-create different worksheets or visualizations.

The other options do not correctly describe the role of parameters in Tableau. Enhancing visual aesthetics pertains more to design choices such as colors, fonts, and layouts rather than the data logic itself. While parameters can be associated with data sources, they do not create separate data sources; they modify how existing data is analyzed. Lastly, parameters facilitate user interactions rather than limit them, as they empower users to manipulate and customize their view of the data based on the inputs they provide.