An overlay in Tableau is a transparent layer that can be placed on top of a visualization to add additional information or context. Overlays can be used to display a variety of data, such as images, text, or shapes. They can be used to highlight specific data points, provide additional context, or create a more visually appealing visualization.
There are many benefits to using overlays in Tableau. First, they can help to improve the clarity and readability of visualizations. By adding additional information or context, overlays can make it easier for viewers to understand the data. Second, overlays can help to highlight specific data points or trends. This can be useful for drawing attention to important insights or for identifying areas that need further investigation. Third, overlays can be used to create more visually appealing visualizations. By adding images, text, or shapes, overlays can help to make visualizations more engaging and interesting.
