How do you emphasize a certain value in Tableau?

Emphasizing a certain value in Tableau can be effectively achieved by using a reference line. Reference lines serve as visual indicators that help to highlight specific values on a chart or a graph, allowing users to see how data points compare to that value. This can be particularly useful for drawing attention to target values, averages, or thresholds that are significant for analysis.

For instance, when analyzing sales data, you might want to add a reference line to indicate a sales target. This line makes it immediately clear how actual sales compare to this goal, providing an insightful visual cue without altering the underlying data or requiring interaction from the user.

While filters can modify which data is displayed, and blending data sources can bring in additional perspectives, neither of these methods focuses on highlighting a specific value within the existing data visualization. Changing the data type primarily affects how data is interpreted rather than enhancing visual emphasis. Thus, using a reference line stands out as the most direct method for emphasizing a particular value in a Tableau visualization.