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The is enabled by default and provides a summary for a data point in your chart. By default, it displays the data bound in the Data Binding tab. For example, in a column chart showing sales by year, the tooltip will display the sales amount for each column along with the corresponding year.
You can display additional data by dragging and dropping a measure into the Tooltip data binding slot.
The tooltip can be further customized in the Inspector Panel by modifying the following properties.
You can disable the tooltip by selecting None from the Tooltip Mode dropdown menu. You can also choose the display mode between Data Point and Category.
Data Point: Shows a tooltip for each individual data point.
For example, this is the tooltip when Tooltip Mode is set to Data Point.

Category: Shows a tooltip for the entire category.
For example, this is the tooltip when Tooltip Mode is set to Category.

Show Category Tracking Area shades the area corresponding to the category axis value (x-axis) of the data point being hovered over. This highlights the entire range along the x-axis that falls within the selected category.
When Show Category Tracking Area is enabled, you can also modify the Tracking Area Color, which allows you to set the color and opacity of the shaded area.
This property draws a vertical line across the chart at the category axis value of the hovered data point.
This property draws a horizontal line connecting the data point to the value axis (y-axis), helping to track the value accurately.
This property draws a vertical line connecting the data point to the category axis (x-axis).
If you enable Show Category Tracking Line, Show Point Cross Value Axis, or Show Point Cross Category Axis, the following dependent properties become available:
Tracking Line Color: Set the color of the line.
Tracking Line Type: Choose between dashed or solid lines.
Tracking Line Width: Set the thickness of the line.